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CCVTC practice questions

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Question 1Cardiac Anatomy and Physiology

Which chamber of the heart receives oxygenated blood returning from the pulmonary veins?

  1. Left atrium Correct answer.
  2. Right atrium
  3. Left ventricle
  4. Right ventricle

Explanation

Pulmonary veins carry oxygenated blood from the lungs back to the heart, and they empty into the left atrium. The left atrium then delivers blood to the left ventricle through the mitral valve.

Question 2Cardiac Anatomy and Physiology

The tricuspid valve separates which two cardiac structures?

  1. Right atrium and right ventricle Correct answer.
  2. Left atrium and left ventricle
  3. Right ventricle and pulmonary artery
  4. Left ventricle and aorta

Explanation

The tricuspid valve is the right-sided atrioventricular valve, sitting between the right atrium and right ventricle. The left-sided counterpart is the mitral valve.

Question 3Cardiac Anatomy and Physiology

Which vessel is the principal source of blood supply to the sinoatrial node in most people?

  1. Left anterior descending artery
  2. Right coronary artery Correct answer.
  3. Left main coronary artery
  4. Circumflex artery

Explanation

In the majority of individuals the sinoatrial node is supplied by a branch of the right coronary artery. The left coronary system more commonly supplies the atrioventricular node only in a minority of people.

Question 4Cardiac Anatomy and Physiology

During which phase of the cardiac cycle does the mitral valve open?

  1. Isovolumetric relaxation
  2. Isovolumetric contraction
  3. Ventricular filling Correct answer.
  4. Ventricular ejection

Explanation

The mitral valve opens when left atrial pressure exceeds left ventricular pressure, which occurs during ventricular filling after the isovolumetric relaxation phase. Blood then flows passively and, later, with atrial contraction into the ventricle.

Question 5Cardiac Anatomy and Physiology

What is the normal resting stroke volume of an average adult?

  1. About 20 mL
  2. About 5 mL
  3. About 70 mL Correct answer.
  4. About 200 mL

Explanation

Stroke volume is the volume ejected by one ventricle per beat, typically around 70 mL at rest. Cardiac output is the product of stroke volume and heart rate.

Question 6Cardiac Anatomy and Physiology

The Frank-Starling relationship describes which phenomenon?

  1. Greater preload increasing stroke volume Correct answer.
  2. Sympathetic stimulation raising contractility
  3. Increased heart rate shortening diastole
  4. Higher afterload reducing ejection fraction

Explanation

The Frank-Starling law states that within physiologic limits, greater ventricular filling (preload) stretches the myocardium and increases the force of contraction and stroke volume. This intrinsic mechanism operates independently of autonomic input.

Question 7Cardiac Anatomy and Physiology

Which structure normally conducts the electrical impulse from the atria to the ventricles?

  1. Bundle of His
  2. Atrioventricular node Correct answer.
  3. Sinoatrial node
  4. Purkinje fibers

Explanation

The atrioventricular node is the only normal electrical pathway between the atria and ventricles, introducing a brief delay before conduction continues to the bundle of His. This delay allows the atria to empty before ventricular contraction.

Question 8Cardiac Anatomy and Physiology

Which ECG wave represents ventricular depolarization?

  1. P wave
  2. T wave
  3. QRS complex Correct answer.
  4. U wave

Explanation

The QRS complex reflects depolarization of the ventricular myocardium, which precedes ventricular contraction. The P wave reflects atrial depolarization and the T wave ventricular repolarization.

Question 9Cardiac Anatomy and Physiology

Which layer of the heart wall is responsible for generating contractile force?

  1. Endocardium
  2. Myocardium Correct answer.
  3. Epicardium
  4. Pericardium

Explanation

The myocardium is the middle muscular layer composed of cardiac muscle cells and is responsible for the pumping action of the heart. The endocardium lines the chambers and the epicardium forms the outer surface.

Question 10Cardiac Anatomy and Physiology

Which valve closes at the onset of isovolumetric contraction?

  1. Aortic valve
  2. Pulmonary valve
  3. Tricuspid valve
  4. Mitral valve Correct answer.

Explanation

Isovolumetric contraction begins when ventricular pressure rises above atrial pressure, closing the atrioventricular valves, including the mitral valve. The semilunar valves remain closed until ventricular pressure exceeds aortic pressure.

Question 11Cardiac Anatomy and Physiology

A patient's heart rate is 75 beats per minute and stroke volume is 80 mL. What is the cardiac output?

  1. 9.0 L/min
  2. 6.0 L/min Correct answer.
  3. 3.0 L/min
  4. 4.5 L/min

Explanation

Cardiac output equals heart rate multiplied by stroke volume. Multiplying 75 beats per minute by 80 mL per beat gives 6000 mL per minute, or 6.0 L/min.

Question 12Cardiac Anatomy and Physiology

Which structure anchors the atrioventricular valve leaflets to the ventricular wall?

  1. Moderator band
  2. Trabeculae carneae
  3. Chordae tendineae Correct answer.
  4. Papillary muscles

Explanation

Chordae tendineae are fibrous cords that connect the valve leaflets to the papillary muscles, preventing prolapse during ventricular systole. The papillary muscles provide the tension but the cords themselves are the tethering structures.

Question 13Cardiac Anatomy and Physiology

The normal pacemaker rate of the sinoatrial node is approximately which value?

  1. 20 to 40 beats per minute
  2. 60 to 100 beats per minute Correct answer.
  3. 120 to 160 beats per minute
  4. 40 to 60 beats per minute

Explanation

The SA node normally fires at an intrinsic rate of about 60 to 100 beats per minute, making it the dominant pacemaker. Lower rates are typical of subsidiary pacemakers such as the AV node and Purkinje system.

Question 14Cardiac Anatomy and Physiology

Which coronary artery most commonly supplies the atrioventricular node?

  1. Left anterior descending artery
  2. Left circumflex artery
  3. Left main coronary artery
  4. Right coronary artery Correct answer.

Explanation

In most hearts the atrioventricular node is supplied by a branch of the right coronary artery. This makes right coronary occlusion a common cause of AV block.

Question 15Cardiac Anatomy and Physiology

Which chamber of the heart has the thickest myocardial wall?

  1. Left atrium
  2. Left ventricle Correct answer.
  3. Right atrium
  4. Right ventricle

Explanation

The left ventricle must generate the highest pressure to eject blood into the systemic circulation, so its myocardium is the thickest. The right ventricle pumps against the low resistance of the pulmonary circulation.

Question 16Cardiac Anatomy and Physiology

Which phase of the cardiac cycle follows isovolumetric relaxation?

  1. Isovolumetric contraction
  2. Ventricular ejection
  3. Ventricular filling Correct answer.
  4. Atrial systole

Explanation

Once ventricular pressure falls below atrial pressure, the AV valves open and ventricular filling begins, ending isovolumetric relaxation. Atrial systole occurs late in the filling phase.

Question 17Cardiac Anatomy and Physiology

Which factor primarily determines resistance to coronary blood flow during systole?

  1. Right atrial pressure
  2. Systemic venous compliance
  3. Left ventricular intramyocardial pressure Correct answer.
  4. Pulmonary capillary wedge pressure

Explanation

During systole, contracting ventricular muscle compresses the intramyocardial vessels, so left ventricular coronary flow is greatest in diastole. High intramyocardial pressure during contraction is the dominant resistance factor.

Question 18Cardiac Anatomy and Physiology

The pulmonary valve opens when which pressure relationship occurs?

  1. Right atrial pressure exceeds right ventricular pressure
  2. Pulmonary artery pressure exceeds right ventricular pressure
  3. Aortic pressure exceeds left ventricular pressure
  4. Right ventricular pressure exceeds pulmonary artery pressure Correct answer.

Explanation

The pulmonary valve opens once right ventricular pressure rises above pulmonary artery pressure during ejection. Closure occurs when the pressure gradient reverses at end-ejection.

Question 19Cardiac Anatomy and Physiology

Which electrophysiologic event corresponds to the plateau phase of the ventricular action potential?

  1. Calcium influx balanced by potassium efflux Correct answer.
  2. Sodium channel inactivation alone
  3. Rapid sodium influx
  4. Rapid potassium efflux

Explanation

The plateau (phase 2) results from slow inward calcium current through L-type channels balanced by outward potassium current. This plateau prolongs the action potential and the refractory period.

Question 20Cardiac Anatomy and Physiology

Which vessel returns deoxygenated blood from the lower body to the right atrium?

  1. Inferior vena cava Correct answer.
  2. Coronary sinus
  3. Pulmonary trunk
  4. Superior vena cava

Explanation

The inferior vena cava drains deoxygenated blood from the lower body into the right atrium. The superior vena cava drains the upper body, and the coronary sinus drains the heart itself.

Question 21Cardiac Anatomy and Physiology

Which of the following best describes the effect of increased afterload on the left ventricle?

  1. It shortens the isovolumetric contraction phase
  2. It increases wall stress and tends to reduce stroke volume Correct answer.
  3. It decreases the pressure the ventricle must generate
  4. It increases stroke volume without changing wall stress

Explanation

Afterload is the resistance the ventricle must overcome to eject blood. Higher afterload raises myocardial wall stress and, for a given contractility, tends to reduce stroke volume and prolong isovolumetric contraction.

Question 22Cardiac Anatomy and Physiology

Which structure separates the right and left ventricles?

  1. Fibrous skeleton
  2. Interatrial septum
  3. Crista terminalis
  4. Interventricular septum Correct answer.

Explanation

The interventricular septum is the muscular and membranous wall dividing the right and left ventricles. The interatrial septum separates the atria.

Question 23Cardiac Anatomy and Physiology

A patient with a mean arterial pressure of 90 mm Hg has a stroke volume of 60 mL and a heart rate of 80 beats per minute. What is the approximate systemic vascular resistance in mm Hg per L/min?

  1. About 9
  2. About 24
  3. About 15
  4. About 19 Correct answer.

Explanation

Cardiac output is 80 times 60 mL, or 4.8 L/min. Systemic vascular resistance approximates mean arterial pressure divided by cardiac output, giving 90 divided by 4.8, or about 19 mm Hg per L/min.

Question 24Cardiac Anatomy and Physiology

Which phase of the ventricular action potential corresponds to the rapid upstroke caused by sodium influx?

  1. Phase 1
  2. Phase 0 Correct answer.
  3. Phase 3
  4. Phase 4

Explanation

Phase 0 is the rapid depolarization driven by opening of fast sodium channels. Phase 1 is early partial repolarization, phase 3 is repolarization, and phase 4 is the resting potential.

Question 25Cardiac Anatomy and Physiology

Which description best characterizes the coronary sinus?

  1. A vein draining the myocardium into the right atrium Correct answer.
  2. A branch of the pulmonary artery
  3. A shunt between the atria
  4. An artery supplying the left ventricle

Explanation

The coronary sinus is a large venous channel that collects most of the heart's venous drainage and empties into the right atrium. It is not an artery or a shunt.

Question 26Cardiac Anatomy and Physiology

Which cardiac chamber receives oxygenated blood returning from the lungs?

  1. Left ventricle
  2. Right atrium
  3. Left atrium Correct answer.
  4. Right ventricle

Explanation

Pulmonary veins deliver oxygenated blood from the lungs into the left atrium, which then empties into the left ventricle. The right-sided chambers handle deoxygenated systemic return.

Question 27Cardiac Anatomy and Physiology

Which valve separates the left atrium from the left ventricle?

  1. Pulmonary valve
  2. Tricuspid valve
  3. Mitral valve Correct answer.
  4. Aortic valve

Explanation

The mitral (bicuspid) valve guards the left atrioventricular orifice between the left atrium and left ventricle. The tricuspid valve occupies the right atrioventricular position.

Question 28Cardiac Anatomy and Physiology

Blood leaving the right ventricle is ejected into which vessel?

  1. Aorta
  2. Pulmonary trunk Correct answer.
  3. Pulmonary vein
  4. Superior vena cava

Explanation

The right ventricle ejects blood through the pulmonary valve into the pulmonary trunk, which divides into the right and left pulmonary arteries. This carries deoxygenated blood toward the lungs.

Question 29Cardiac Anatomy and Physiology

Which structure forms the primary pacemaker of the heart?

  1. Bundle of His
  2. Purkinje fibers
  3. Sinoatrial node Correct answer.
  4. Atrioventricular node

Explanation

The sinoatrial node in the upper right atrium has the fastest spontaneous depolarization rate and therefore sets the rhythm for the heart. Slower latent pacemakers are normally overdrive-suppressed by it.

Question 30Cardiac Anatomy and Physiology

During which cardiac phase do the atrioventricular valves close?

  1. Isovolumetric contraction Correct answer.
  2. Atrial systole
  3. Isovolumetric relaxation
  4. Ventricular ejection

Explanation

As ventricular pressure rises above atrial pressure at the start of systole, the atrioventricular valves close, sealing the ventricles during isovolumetric contraction. This closure produces the first heart sound.

Question 31Cardiac Anatomy and Physiology

A patient has a stroke volume of 70 mL and an ejection fraction of 60 percent. What is the end-diastolic volume?

  1. 130 mL
  2. 117 mL Correct answer.
  3. 175 mL
  4. 42 mL

Explanation

Ejection fraction equals stroke volume divided by end-diastolic volume, so end-diastolic volume equals stroke volume divided by ejection fraction. Dividing 70 mL by 0.60 gives approximately 117 mL.

Question 32Cardiac Anatomy and Physiology

Which change in the circulation would most directly increase left ventricular preload?

  1. Increased aortic valve resistance
  2. Decreased heart rate with fixed venous return
  3. Increased systemic vascular resistance
  4. Increased venous return Correct answer.

Explanation

Preload reflects ventricular filling and is determined largely by venous return and end-diastolic volume. Greater venous return increases stretch of the ventricular wall before contraction.

Question 33Cardiac Anatomy and Physiology

Which structure separates the left atrium from the right atrium in the adult heart?

  1. Fibrous pericardium
  2. Interventricular septum
  3. Interatrial septum Correct answer.
  4. Coronary sulcus

Explanation

The interatrial septum is the wall between the two atria and contains the fossa ovalis, the remnant of the fetal foramen ovale. The interventricular septum divides the ventricles instead.

Question 34Cardiac Anatomy and Physiology

Which vessel most commonly supplies the sinoatrial node?

  1. Right coronary artery Correct answer.
  2. Left main coronary artery
  3. Left anterior descending artery
  4. Left circumflex artery

Explanation

In most individuals the sinoatrial node artery arises from the proximal right coronary artery. The left circumflex can supply it in a minority of cases.

Question 35Cardiac Anatomy and Physiology

Which receptor-mediated effect on the heart is produced by stimulation of beta-1 adrenergic receptors?

  1. Arteriolar constriction
  2. Decreased heart rate
  3. Increased contractility Correct answer.
  4. Decreased conduction velocity through the atrioventricular node

Explanation

Beta-1 receptors on ventricular myocardium couple to stimulatory G proteins, raising cyclic AMP and calcium handling to increase contractile force. They also raise heart rate and conduction velocity.

Question 36Cardiac Anatomy and Physiology

Which statement correctly describes the relationship between mean arterial pressure, cardiac output, and total peripheral resistance?

  1. Mean arterial pressure equals total peripheral resistance divided by cardiac output
  2. Mean arterial pressure equals cardiac output divided by total peripheral resistance
  3. Mean arterial pressure equals cardiac output multiplied by total peripheral resistance Correct answer.
  4. Mean arterial pressure equals cardiac output plus total peripheral resistance

Explanation

Mean arterial pressure is the product of cardiac output and total peripheral resistance, paralleling Ohm's law for electrical circuits. A rise in either factor raises pressure if the other is unchanged.

Question 37Cardiac Anatomy and Physiology

Which feature distinguishes the right ventricle from the left ventricle on direct inspection?

  1. Presence of trabeculae carneae
  2. A more conical shape with a smooth outflow tract Correct answer.
  3. Presence of papillary muscles
  4. A thicker free wall

Explanation

The right ventricle is crescent-shaped and has a smooth, conically shaped infundibulum leading to the pulmonary valve. The left ventricle is thicker-walled and more ellipsoidal.

Question 38Cardiac Anatomy and Physiology

A patient in septic shock has a cardiac output of 8 L/min and a mean arterial pressure of 60 mm Hg. What is the approximate total peripheral resistance?

  1. 480 mm Hg·min/L
  2. 0.13 mm Hg·min/L
  3. 7.5 mm Hg·min/L Correct answer.
  4. 68 mm Hg·min/L

Explanation

Total peripheral resistance equals mean arterial pressure divided by cardiac output. Dividing 60 mm Hg by 8 L/min yields 7.5 mm Hg·min/L, a low value consistent with vasodilation.

Question 39Cardiac Anatomy and Physiology

Which mechanical event produces the second heart sound?

  1. Opening of the atrioventricular valves
  2. Closure of the atrioventricular valves
  3. Closure of the semilunar valves Correct answer.
  4. Opening of the semilunar valves

Explanation

The second heart sound arises from closure of the aortic and pulmonary valves at the end of ventricular ejection, marking the onset of isovolumetric relaxation. The first sound reflects atrioventricular valve closure.

Question 40Cardiac Anatomy and Physiology

Which statement best explains why coronary blood flow to the left ventricle falls during systole?

  1. Coronary arteries are compressed by contracting myocardium Correct answer.
  2. Coronary resistance vessels dilate maximally during systole
  3. Coronary venous pressure exceeds aortic pressure during systole
  4. Aortic pressure falls below coronary pressure during systole

Explanation

Left ventricular contraction compresses the intramyocardial coronary vessels, so most left coronary flow occurs during diastole. This systolic compression is why diastolic pressure and duration strongly influence myocardial perfusion.

Question 41Extracardiac and Thoracic Anatomy and Physiology

Which structure separates the thoracic cavity from the abdominal cavity?

  1. The costal margin
  2. The diaphragm Correct answer.
  3. The sternal angle
  4. The mediastinal pleura

Explanation

The diaphragm is the musculotendinous dome that forms the floor of the thoracic cavity and the roof of the abdominal cavity. It is the principal boundary between these two compartments.

Question 42Extracardiac and Thoracic Anatomy and Physiology

How many lobes does the right lung normally have?

  1. Two
  2. Four
  3. Three Correct answer.
  4. Five

Explanation

The right lung is divided by the oblique and horizontal fissures into superior, middle, and inferior lobes. The left lung typically has only two lobes.

Question 43Extracardiac and Thoracic Anatomy and Physiology

The pleural space normally contains which of the following?

  1. Cartilage and fibrous tissue
  2. A thin film of serous fluid Correct answer.
  3. Air at atmospheric pressure
  4. A small volume of whole blood

Explanation

The pleural cavity is a potential space between the visceral and parietal pleurae containing only a thin lubricating film of serous fluid. This fluid allows the layers to slide and transmits pressure changes.

Question 44Extracardiac and Thoracic Anatomy and Physiology

Which muscle is the principal muscle of inspiration during quiet breathing?

  1. The external intercostal muscle
  2. The diaphragm Correct answer.
  3. The rectus abdominis
  4. The internal intercostal muscle

Explanation

Contraction of the diaphragm flattens its dome and increases thoracic volume, generating most of the tidal volume during quiet inspiration. The external intercostals assist but are not the principal muscle.

Question 45Extracardiac and Thoracic Anatomy and Physiology

The trachea bifurcates into the right and left main bronchi at which level?

  1. The level of the first rib
  2. The xiphoid process (approximately T9)
  3. The level of the fifth cervical vertebra
  4. The sternal angle (approximately T4-T5) Correct answer.

Explanation

The tracheal bifurcation, or carina, lies at the level of the sternal angle, corresponding roughly to the T4-T5 vertebral level. This is a standard landmark for the lower trachea.

Question 46Extracardiac and Thoracic Anatomy and Physiology

Which vessel returns systemic venous blood from the lower body to the right atrium?

  1. The inferior vena cava Correct answer.
  2. The aorta
  3. The superior vena cava
  4. The pulmonary vein

Explanation

The inferior vena cava drains venous blood from the lower body into the right atrium. The superior vena cava drains the upper body.

Question 47Extracardiac and Thoracic Anatomy and Physiology

Which of the following is a function of the thoracic cage?

  1. Filtering lymph
  2. Producing red blood cells in adults
  3. Storing bile
  4. Protecting the heart and lungs Correct answer.

Explanation

The ribs, sternum, and thoracic vertebrae form a protective cage around the heart, lungs, and great vessels. It also supports breathing mechanics.

Question 48Extracardiac and Thoracic Anatomy and Physiology

Which nerve supplies motor innervation to the diaphragm?

  1. The phrenic nerve Correct answer.
  2. The intercostal nerve
  3. The vagus nerve
  4. The recurrent laryngeal nerve

Explanation

The phrenic nerve (arising mainly from C3-C5) provides the sole motor supply to the diaphragm. Its cervical origin explains why diaphragm function can be affected by neck-level spinal injury.

Question 49Extracardiac and Thoracic Anatomy and Physiology

During inspiration, what happens to intrathoracic pressure relative to atmospheric pressure?

  1. It becomes more positive
  2. It oscillates rapidly above and below atmospheric pressure
  3. It remains exactly equal to atmospheric pressure
  4. It becomes more negative Correct answer.

Explanation

As thoracic volume increases during inspiration, intrapleural and alveolar pressures fall below atmospheric pressure, drawing air into the lungs. Expiration reverses this gradient.

Question 50Extracardiac and Thoracic Anatomy and Physiology

A patient has a chest tube placed to drain a large pleural effusion. Which pleural layer lines the inner surface of the thoracic wall?

  1. The parietal pleura Correct answer.
  2. The visceral pleura
  3. The endothoracic fascia
  4. The visceral pericardium

Explanation

The parietal pleura lines the inner thoracic wall, diaphragm, and mediastinum, and it is richly innervated with pain fibers. The visceral pleura covers the lung surface itself.