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ABPTS PCS study materials
ABPTS PCS study resources

ABPTS PCS practice questions

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Question 1Human Development and Aging

At approximately what age does a typically developing infant first achieve independent sitting without support?

  1. 18 to 20 months
  2. 2 to 3 months
  3. 12 to 14 months
  4. 6 to 8 months Correct answer.

Explanation

Independent sitting without support typically emerges between 6 and 8 months as trunk and hip control mature. Earlier sitting requires hand support or propping, and by 12 months most infants are pulling to stand or cruising.

Question 2Human Development and Aging

Which primitive reflex typically integrates (disappears) first in normal development?

  1. Moro reflex Correct answer.
  2. Positive support reflex
  3. Galant reflex
  4. Asymmetric tonic neck reflex

Explanation

The Moro reflex usually integrates by about 4 to 6 months, making it one of the earlier reflexes to fade. Persistence beyond this window suggests neurologic immaturity or pathology.

Question 3Human Development and Aging

A 9-month-old infant is placed in prone and spontaneously assumes a hands-and-knees position and rocks. Which developmental process does this best illustrate?

  1. Development of antigravity extension against gravity Correct answer.
  2. Onset of the plantar grasp reflex
  3. Emergence of the symmetric tonic neck reflex
  4. Integration of the landau reaction

Explanation

Assuming and rocking in a hands-and-knees position reflects antigravity extension and postural control against gravity in prone. This precedes creeping on hands and knees.

Question 4Human Development and Aging

Which statement best characterizes the direction of typical motor development?

  1. Random and non-sequential emergence of skills
  2. Distal-to-proximal and caudal-to-cephalic progression
  3. Cephalocaudal and proximodistal progression Correct answer.
  4. Purely proximodistal with no cephalocaudal component

Explanation

Motor development generally proceeds cephalocaudally (head to toe) and proximodistally (trunk to extremities). Head control precedes trunk control, which precedes fine distal control.

Question 5Human Development and Aging

A child can hop on one foot, copy a square, and dress with minimal assistance. These skills are most consistent with which age range?

  1. 2 years
  2. 8 years
  3. 3 years
  4. 5 years Correct answer.

Explanation

Hopping on one foot, copying a square, and near-independent dressing are characteristic of approximately 5 years. These reflect mature gross motor, visual-motor, and self-care skills.

Question 6Human Development and Aging

Which fine motor milestone is typically achieved first?

  1. Pincer grasp with thumb and index finger
  2. Palmar grasp of a cube Correct answer.
  3. Voluntary release of a cube into a cup
  4. Building a tower of three cubes

Explanation

A palmar grasp emerges around 5 to 6 months, earlier than the pincer grasp, purposeful release, and cube stacking. Fine motor control advances from whole-hand to isolated finger use.

Question 7Human Development and Aging

A toddler demonstrates a wide-based gait with arms held high and frequent falls. This pattern most likely represents which finding?

  1. A sign of spastic diplegia
  2. A manifestation of muscular dystrophy
  3. A normal transitional gait of early walking Correct answer.
  4. Evidence of cerebellar ataxia

Explanation

Early walkers commonly show a wide base, high guard arms, and frequent falls as balance matures. This pattern typically resolves as gait stability improves over months.

Question 8Human Development and Aging

At what age does a child typically begin to use two- to three-word phrases?

  1. 18 to 24 months Correct answer.
  2. 12 to 15 months
  3. 42 to 48 months
  4. 30 to 36 months

Explanation

Two- to three-word combinations typically emerge between 18 and 24 months as expressive language expands. Single words predominate before this period.

Question 9Human Development and Aging

Which developmental change in vision is most characteristic of normal aging in older adults?

  1. Increased pupil diameter
  2. Enhanced contrast sensitivity
  3. Decreased lens accommodation Correct answer.
  4. Improved dark adaptation

Explanation

Presbyopia reflects reduced lens accommodation with age, impairing near focus. Other common changes include reduced pupil size and diminished contrast sensitivity.

Question 10Human Development and Aging

A 75-year-old reports difficulty maintaining balance when turning and when walking in dim light. Which age-related change most directly contributes?

  1. Increased muscle spindle sensitivity
  2. Decline in vestibular and visual contributions to postural control Correct answer.
  3. Enhanced proprioceptive acuity
  4. Increased vestibular hair cell density

Explanation

Aging reduces vestibular function and visual input quality while proprioception also declines, compromising postural control in challenging conditions. This increases fall risk during turning and low-light walking.

Question 11Human Development and Aging

Which statement about age-related changes in muscle is accurate?

  1. Type I fibers atrophy preferentially
  2. Motor unit number increases with aging
  3. Total muscle mass increases after age 70
  4. Type II fiber size and number decline with age Correct answer.

Explanation

Sarcopenia involves preferential loss of type II fibers and reduced motor unit number, contributing to declines in power and speed. Type I fibers are relatively preserved.

Question 12Human Development and Aging

A 70-year-old has reduced maximal heart rate and stroke volume during exercise. Which physiologic aging change best explains the reduced maximal cardiac output?

  1. Enhanced diastolic filling at high intensity
  2. Increased maximal heart rate
  3. Reduced beta-adrenergic responsiveness Correct answer.
  4. Increased arterial compliance

Explanation

Reduced beta-adrenergic responsiveness limits heart rate and contractility at maximal effort, lowering maximal cardiac output. This contributes to the age-related decline in aerobic capacity.

Question 13Human Development and Aging

Which finding is most consistent with normal cognitive aging rather than pathologic decline?

  1. Rapid loss of semantic memory over months
  2. Slowed processing speed with preserved learned knowledge Correct answer.
  3. Acute onset of disorientation to place
  4. Progressive loss of procedural memory

Explanation

Normal aging commonly slows processing speed while crystallized abilities and learned knowledge remain stable. Rapid or acute declines suggest pathology and warrant evaluation.

Question 14Human Development and Aging

A 6-month-old does not yet roll and has poor head control in supported sitting. Which action is most appropriate?

  1. Recommend immediate orthotic bracing of the trunk
  2. Reassure the family that all infants develop at their own pace and recheck at 18 months
  3. Refer for developmental evaluation while continuing to monitor and provide guidance Correct answer.
  4. Advise stopping tummy time to reduce frustration

Explanation

Absent rolling and poor head control at 6 months fall outside typical expectations and warrant developmental evaluation. Early identification supports timely intervention.

Question 15Human Development and Aging

Which principle best explains why early intervention is emphasized for infants with identified developmental delay?

  1. Muscle fiber type is immutable after birth
  2. Motor learning is fixed and cannot change after infancy
  3. Reflexes never integrate after age 2
  4. Neuroplasticity is greatest early in life Correct answer.

Explanation

Heightened neuroplasticity in early childhood allows experience to shape neural connections, supporting skill acquisition. This underlies the emphasis on early intervention.

Question 16Human Development and Aging

A 14-month-old is not yet walking but pulls to stand and cruises along furniture. What is the most appropriate interpretation?

  1. This indicates a definite motor disorder
  2. This requires immediate referral for a wheelchair
  3. This suggests a loss of previously acquired skills
  4. This is within the typical range for walking onset Correct answer.

Explanation

Independent walking typically emerges between 12 and 15 months, and cruising at 14 months is within normal variation. Continued monitoring with encouragement is appropriate.

Question 17Human Development and Aging

Which change in gait is most characteristic of healthy older adults compared with younger adults?

  1. Reduced gait speed and shorter step length Correct answer.
  2. Decreased stride time variability
  3. Increased push-off power
  4. Increased step length

Explanation

Older adults commonly walk more slowly with shorter steps and a wider base as a compensatory strategy. These changes reflect reduced strength, balance, and power.

Question 18Human Development and Aging

A clinician wants to promote head and trunk control in a 4-month-old with delayed postural development. Which activity is most consistent with developmental principles?

  1. Prone positioning with graded support to encourage antigravity extension Correct answer.
  2. Immobilizing the trunk in a rigid orthosis
  3. Passive stretching of the neck into flexion
  4. Prolonged supine positioning with the head fixed in midline

Explanation

Prone positioning with graded support encourages antigravity extension and head/trunk control, aligning with cephalocaudal development. Activities should be challenging yet achievable.

Question 19Human Development and Aging

Which statement about the development of hand function is most accurate?

  1. Prehension emerges before reaching
  2. Grasp patterns progress from crude whole-hand to refined finger control Correct answer.
  3. Voluntary release precedes grasp
  4. Bilateral hand use develops before unilateral reach

Explanation

Hand function advances from crude palmar grasping to refined pincer and manipulative control. Reaching precedes grasp, and release follows grasp acquisition.

Question 20Human Development and Aging

An older adult shows reduced ability to recover from a small postural perturbation while standing. Which factor most likely underlies this decline?

  1. Increased speed of automatic postural responses
  2. Increased ankle strength
  3. Slower and less consistent postural response latencies Correct answer.
  4. Enhanced sensory reweighting

Explanation

Aging is associated with slower, more variable automatic postural responses, reducing the ability to recover from perturbations. This contributes to increased fall risk.

Question 21Body Systems and Functions

Which structure primarily limits anterior translation of the tibia on the femur at the knee?

  1. Medial collateral ligament
  2. Anterior cruciate ligament Correct answer.
  3. Posterior cruciate ligament
  4. Lateral collateral ligament

Explanation

The anterior cruciate ligament resists anterior tibial translation and controls rotational stability. The posterior cruciate ligament restrains posterior translation, while the collaterals resist varus and valgus stress.

Question 22Body Systems and Functions

During normal quiet inspiration, which muscle is the principal driver of ventilation?

  1. External intercostals
  2. Diaphragm Correct answer.
  3. Sternocleidomastoid
  4. Rectus abdominis

Explanation

The diaphragm descends during inspiration, increasing thoracic volume and lowering intrathoracic pressure. Accessory muscles such as the sternocleidomastoid contribute mainly during exertion or distress.

Question 23Body Systems and Functions

A clinician documents a blood pressure of 122/78 mm Hg. Which value represents the pressure during ventricular relaxation?

  1. 78 mm Hg Correct answer.
  2. 122 mm Hg
  3. 100 mm Hg
  4. 50 mm Hg

Explanation

The diastolic value reflects arterial pressure during ventricular relaxation and filling. The systolic value reflects peak pressure during ventricular contraction.

Question 24Body Systems and Functions

Which cranial nerve provides motor innervation to the muscles of facial expression?

  1. Hypoglossal
  2. Glossopharyngeal
  3. Facial Correct answer.
  4. Trigeminal

Explanation

The facial nerve supplies the muscles of facial expression via its motor branch. The trigeminal nerve is primarily sensory to the face with motor supply to mastication.

Question 25Body Systems and Functions

Which type of muscle fiber is characterized by high oxidative capacity and resistance to fatigue?

  1. Type IIx
  2. Type IIa
  3. Type I Correct answer.
  4. Type IIb

Explanation

Type I fibers have abundant mitochondria and myoglobin, giving them high oxidative capacity and fatigue resistance. Type II fibers favor glycolytic, fast-twitch function.

Question 26Body Systems and Functions

Which hormone is secreted by the posterior pituitary?

  1. Growth hormone
  2. Antidiuretic hormone Correct answer.
  3. Adrenocorticotropic hormone
  4. Thyroid-stimulating hormone

Explanation

The posterior pituitary stores and releases antidiuretic hormone and oxytocin, which are produced in the hypothalamus. The other listed hormones are produced and released by the anterior pituitary.

Question 27Body Systems and Functions

Which spinal tract carries conscious proprioception and discriminative touch to the cerebral cortex?

  1. Dorsal column-medial lemniscus pathway Correct answer.
  2. Spinothalamic tract
  3. Corticospinal tract
  4. Spinocerebellar tract

Explanation

The dorsal column-medial lemniscus pathway transmits conscious proprioception, vibration, and fine touch. The spinothalamic tract carries pain and temperature, and the corticospinal tract is motor.

Question 28Body Systems and Functions

Which joint motion occurs in the frontal plane at the ankle when the sole of the foot turns toward the midline?

  1. Plantar flexion
  2. Eversion
  3. Inversion Correct answer.
  4. Dorsiflexion

Explanation

Inversion tilts the sole of the foot medially in the frontal plane. Eversion is the opposite motion, and dorsiflexion and plantar flexion occur in the sagittal plane.

Question 29Body Systems and Functions

A patient has weakness lifting the arm above shoulder height with a painful arc between 60 and 120 degrees. Which structure is most implicated?

  1. Long head of biceps tendon
  2. Supraspinatus tendon Correct answer.
  3. Glenoid labrum
  4. Coracohumeral ligament

Explanation

A painful arc during mid-range abduction suggests subacromial impingement involving the supraspinatus tendon. The supraspinatus initiates abduction and passes beneath the acromion.

Question 30Body Systems and Functions

Which structure is most at risk during a forceful valgus stress to the knee with the foot planted?

  1. Medial collateral ligament Correct answer.
  2. Lateral collateral ligament
  3. Posterior cruciate ligament
  4. Iliotibial band

Explanation

A valgus force opens the medial joint line and stresses the medial collateral ligament. The lateral collateral ligament is stressed by varus force.

Question 31Body Systems and Functions

During a graded exercise test, which physiologic change indicates an appropriate cardiovascular response to increasing workload?

  1. Falling systolic pressure with rising workload
  2. Decreasing heart rate with rising workload
  3. Rising heart rate proportional to workload Correct answer.
  4. Rising diastolic pressure to 130 mm Hg

Explanation

Heart rate normally rises with increasing workload to augment cardiac output. A fall in systolic pressure or an excessive diastolic rise suggests an abnormal response.

Question 32Body Systems and Functions

A patient with a lesion of the common fibular (peroneal) nerve would most likely demonstrate which impairment?

  1. Loss of hip adduction
  2. Inability to dorsiflex the ankle Correct answer.
  3. Inability to plantar flex the ankle
  4. Loss of knee flexion

Explanation

The common fibular nerve supplies the dorsiflexors and evertors of the ankle. Its injury produces foot drop and impaired dorsiflexion.

Question 33Body Systems and Functions

Which lung volume cannot be measured by simple spirometry alone?

  1. Expiratory reserve volume
  2. Tidal volume
  3. Inspiratory reserve volume
  4. Residual volume Correct answer.

Explanation

Residual volume remains in the lungs after maximal exhalation and requires indirect methods such as body plethysmography or gas dilution. The other listed volumes are directly measurable by spirometry.

Question 34Body Systems and Functions

A patient sustains a midshaft humerus fracture and develops wrist drop. Which nerve is most likely injured?

  1. Ulnar nerve
  2. Radial nerve Correct answer.
  3. Median nerve
  4. Musculocutaneous nerve

Explanation

The radial nerve runs in the spiral groove of the humerus and supplies the wrist extensors. Injury produces wrist drop and impaired finger extension.

Question 35Body Systems and Functions

Which change in the musculoskeletal system is most characteristic of normal aging in adults?

  1. Increased bone mineral density
  2. Increased joint cartilage thickness
  3. Decreased type II muscle fiber size Correct answer.
  4. Increased resting metabolic rate

Explanation

Aging is associated with atrophy of fast-twitch type II fibers, reducing power and speed. Bone density and cartilage thickness tend to decline rather than increase.

Question 36Body Systems and Functions

A patient reports numbness along the palmar surface of the thumb, index, and middle fingers. Which nerve is most likely affected?

  1. Axillary nerve
  2. Ulnar nerve
  3. Median nerve Correct answer.
  4. Radial nerve

Explanation

The median nerve provides sensation to the palmar thumb, index, middle, and half of the ring finger. Compression at the carpal tunnel commonly produces this pattern.

Question 37Body Systems and Functions

Which muscle group acts as the primary ankle plantar flexors during push-off in gait?

  1. Peroneus longus and peroneus brevis
  2. Tibialis posterior and flexor digitorum longus
  3. Gastrocnemius and soleus Correct answer.
  4. Tibialis anterior and extensor digitorum longus

Explanation

The gastrocnemius and soleus form the triceps surae, the principal plantar flexors generating push-off power. The tibialis anterior is a dorsiflexor, and the peroneals are evertors.

Question 38Body Systems and Functions

A patient with chronic obstructive pulmonary disease demonstrates use of accessory muscles and pursed-lip breathing. Which physiologic problem do these adaptations address?

  1. Air trapping and dynamic hyperinflation Correct answer.
  2. Increased lung compliance
  3. Excess surfactant production
  4. Elevated cardiac output

Explanation

Pursed-lip breathing creates back pressure that helps maintain airway patency and reduce air trapping. Accessory muscle use reflects increased work of breathing from hyperinflation.

Question 39Body Systems and Functions

Which structure forms the primary restraint against posterior translation of the humeral head during a fall on an outstretched hand?

  1. Posterior capsule Correct answer.
  2. Superior glenohumeral ligament
  3. Coracoacromial ligament
  4. Anterior capsule

Explanation

The posterior capsule resists posterior translation of the humeral head. The anterior capsule and ligaments restrain anterior and inferior translation.

Question 40Body Systems and Functions

A patient with a T6 complete spinal cord injury would be expected to retain which function?

  1. Independent ambulation
  2. Diaphragmatic breathing Correct answer.
  3. Voluntary bowel control
  4. Intact lower extremity sensation

Explanation

The phrenic nerve arises from C3-C5, so diaphragmatic breathing is preserved with a T6 injury. Bowel control, ambulation, and lower extremity sensation depend on sacral and lumbar segments.

Question 41Body Systems and Functions

Which factor most directly increases stroke volume according to the Frank-Starling mechanism?

  1. Decreased venous return
  2. Increased afterload
  3. Increased end-diastolic volume Correct answer.
  4. Increased heart rate

Explanation

Greater end-diastolic volume stretches myocardial fibers, increasing contractile force and stroke volume. Afterload increases oppose ejection, and heart rate affects cardiac output through other means.

Question 42Body Systems and Functions

A patient demonstrates loss of pain and temperature sensation on the left side of the body below the lesion with preserved proprioception. Which pathway is affected?

  1. Right spinothalamic tract Correct answer.
  2. Right dorsal spinocerebellar tract
  3. Left corticospinal tract
  4. Left dorsal column

Explanation

Pain and temperature fibers cross near their entry level and ascend in the contralateral spinothalamic tract. A right-sided cord lesion therefore produces left-sided loss of pain and temperature.

Question 43Body Systems and Functions

Which acid-base disturbance is most consistent with prolonged vomiting?

  1. Metabolic alkalosis with compensatory hypoventilation Correct answer.
  2. Metabolic acidosis with compensatory hyperventilation
  3. Respiratory acidosis with renal bicarbonate retention
  4. Respiratory alkalosis with renal bicarbonate excretion

Explanation

Vomiting causes loss of gastric acid, producing metabolic alkalosis. Compensatory hypoventilation raises carbon dioxide to help normalize pH.

Question 44Body Systems and Functions

During a resisted isometric contraction, which neural mechanism contributes to increased force output in the first weeks of training?

  1. Increased capillary density
  2. Increased muscle fiber cross-sectional area
  3. Enhanced motor unit recruitment and rate coding Correct answer.
  4. Proliferation of mitochondria

Explanation

Early strength gains are largely neural, driven by greater motor unit recruitment and firing rate. Hypertrophy, capillary changes, and mitochondrial proliferation occur over longer periods.

Question 45Body Systems and Functions

A lesion at the level of the lateral corticospinal tract in the cervical cord would most likely produce which finding?

  1. Contralateral loss of vibration sense
  2. Ipsilateral loss of pain sensation
  3. Ipsilateral spastic weakness below the lesion Correct answer.
  4. Contralateral flaccid weakness below the lesion

Explanation

Corticospinal fibers have already crossed in the medulla, so a cervical lateral cord lesion causes ipsilateral upper motor neuron signs below the level. Flaccid weakness suggests lower motor neuron involvement.

Question 46Body Systems and Functions

Which type of muscle fiber is characterized by a high oxidative capacity, slow contraction speed, and resistance to fatigue?

  1. Type I Correct answer.
  2. Type IIb
  3. Type IIx
  4. Type IIa

Explanation

Type I (slow-twitch) fibers rely on aerobic metabolism, have abundant mitochondria and capillaries, and resist fatigue, making them suited to postural and endurance activity. Type II fibers contract faster but fatigue more readily.

Question 47Body Systems and Functions

Which component of the sarcomere shortens during a concentric muscle contraction?

  1. I band
  2. A band
  3. H zone Correct answer.
  4. Z line

Explanation

During contraction, actin filaments slide toward the sarcomere center, narrowing the H zone and I band while the A band (thick filament length) stays constant. The Z lines move closer together but do not themselves shorten.

Question 48Body Systems and Functions

A patient has a lesion of the left optic tract. Which visual field defect is most likely?

  1. Right homonymous hemianopsia Correct answer.
  2. Left homonymous hemianopsia
  3. Left monocular blindness
  4. Bitemporal hemianopsia

Explanation

The left optic tract carries fibers from the left temporal retina and right nasal retina, which together represent the right visual field. A lesion therefore produces a right homonymous hemianopsia.

Question 49Body Systems and Functions

Which hormone raises serum calcium by increasing bone resorption and renal calcium reabsorption?

  1. Calcitonin
  2. Insulin
  3. Aldosterone
  4. Parathyroid hormone Correct answer.

Explanation

Parathyroid hormone raises serum calcium through bone resorption, increased renal tubular reabsorption, and activation of vitamin D to enhance intestinal absorption. Calcitonin has the opposite effect on serum calcium.

Question 50Body Systems and Functions

A patient with a complete lesion of the left phrenic nerve would be expected to demonstrate which finding on examination?

  1. Weakness of the left deltoid and biceps
  2. Absent gag reflex on the left
  3. Paradoxical elevation of the left hemidiaphragm during inspiration Correct answer.
  4. Loss of sensation over the anterior chest wall only

Explanation

The phrenic nerve (C3-C5) provides the sole motor supply to the diaphragm; unilateral paralysis causes the affected hemidiaphragm to rise during inspiration as negative intrathoracic pressure draws it upward. This is observed as paradoxical movement on fluoroscopy or ultrasound.