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SC Esthetician practice questions

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Question 1Scientific Concepts: Anatomy, Physiology, and Chemistry

Which layer of the epidermis is the outermost layer, made up of flattened, keratin-filled cells?

  1. Stratum granulosum
  2. Stratum corneum Correct answer.
  3. Stratum spinosum
  4. Stratum basale

Explanation

The epidermis is arranged in layers, and the surface layer is the stratum corneum, whose cells have lost their nuclei and are packed with keratin. This layer forms the skin's main physical barrier against water loss and outside irritants.

Question 2Scientific Concepts: Anatomy, Physiology, and Chemistry

Which cells produce the pigment that gives skin its color?

  1. Langerhans cells
  2. Fibroblasts
  3. Keratinocytes
  4. Melanocytes Correct answer.

Explanation

Melanocytes sit in the basal layer of the epidermis and manufacture melanin inside structures called melanosomes. The melanin is then transferred to nearby keratinocytes, where it colors the skin and helps screen ultraviolet light.

Question 3Scientific Concepts: Anatomy, Physiology, and Chemistry

Which muscle is primarily responsible for chewing?

  1. Masseter Correct answer.
  2. Frontalis
  3. Zygomaticus
  4. Orbicularis oris

Explanation

The masseter is one of the muscles of mastication; it runs from the cheekbone to the lower jaw and elevates the mandible to close the mouth with force. Muscles of facial expression, by contrast, move the skin rather than the jaw.

Question 4Scientific Concepts: Anatomy, Physiology, and Chemistry

The skin's acid mantle has a pH that is best described as:

  1. Slightly acidic, near pH 5 Correct answer.
  2. Slightly alkaline, near pH 7.8
  3. Neutral, near pH 7
  4. Strongly alkaline, near pH 9

Explanation

The mixture of sebum and sweat on the skin surface creates a slightly acidic film, usually in the range of about 4.5 to 5.5. This acidity discourages bacteria and helps keep the barrier enzymes working properly.

Question 5Scientific Concepts: Anatomy, Physiology, and Chemistry

What is the main function of the cell nucleus?

  1. Houses DNA and controls activity Correct answer.
  2. Assembles proteins from amino acids
  3. Digests cellular waste
  4. Produces energy for the cell

Explanation

The nucleus contains the cell's genetic material and directs which proteins the cell makes, thereby controlling its activities and its division. Other organelles carry out the energy production, digestion, and protein assembly themselves.

Question 6Scientific Concepts: Anatomy, Physiology, and Chemistry

What is the smallest unit of a chemical element that still keeps the properties of that element?

  1. Molecule
  2. Atom Correct answer.
  3. Mixture
  4. Compound

Explanation

An atom is the smallest particle of an element that retains that element's chemical identity. Atoms join together to form molecules, and different elements combine to form compounds.

Question 7Scientific Concepts: Anatomy, Physiology, and Chemistry

Which muscle raises the eyebrows and creates horizontal lines across the forehead?

  1. Orbicularis oculi
  2. Temporalis
  3. Frontalis Correct answer.
  4. Procerus

Explanation

The frontalis covers the forehead and pulls the scalp forward, lifting the brows and folding the skin into horizontal lines. It is the muscle most often targeted when treating expression lines on the forehead.

Question 8Scientific Concepts: Anatomy, Physiology, and Chemistry

Which glands secrete sebum into the hair follicle?

  1. Ceruminous glands
  2. Sebaceous glands Correct answer.
  3. Sudoriferous glands
  4. Mammary glands

Explanation

Sebaceous glands are attached to hair follicles and release an oily substance called sebum, which lubricates the skin and hair. Their activity is strongly influenced by hormones, which is why oiliness changes at puberty.

Question 9Scientific Concepts: Anatomy, Physiology, and Chemistry

In which epidermal layer does most new skin cell production by cell division take place?

  1. Stratum corneum
  2. Stratum granulosum
  3. Stratum basale Correct answer.
  4. Stratum lucidum

Explanation

The stratum basale is a single layer of cells resting on the basement membrane, and it is here that mitosis produces new keratinocytes. These cells are pushed upward and gradually change as they mature into the surface layers.

Question 10Scientific Concepts: Anatomy, Physiology, and Chemistry

Which two proteins in the dermis give it strength and elasticity?

  1. Hemoglobin and fibrin
  2. Keratin and melanin
  3. Collagen and elastin Correct answer.
  4. Sebum and sweat

Explanation

The dermis is a fibrous network in which collagen provides tensile strength and elastin allows the tissue to stretch and recoil. As these fibers break down with age and sun exposure, the skin sags and wrinkles.

Question 11Scientific Concepts: Anatomy, Physiology, and Chemistry

The primary role of eccrine sweat glands is to:

  1. Cool the body by sweating Correct answer.
  2. Produce sebum for lubrication
  3. Produce melanin for pigmentation
  4. Secrete hormones into the blood

Explanation

Eccrine glands are distributed over most of the body and release a watery secretion onto the skin surface, where evaporation removes heat. This makes them central to temperature regulation rather than to lubrication or pigmentation.

Question 12Scientific Concepts: Anatomy, Physiology, and Chemistry

Which nerve is the chief sensory nerve of the face, carrying touch and pain signals from the skin?

  1. Optic nerve
  2. Trigeminal nerve Correct answer.
  3. Vagus nerve
  4. Facial nerve

Explanation

The trigeminal nerve is the fifth cranial nerve and supplies sensation to the face through its three main branches. The facial nerve, by contrast, is mainly motor and moves the muscles of expression.

Question 13Scientific Concepts: Anatomy, Physiology, and Chemistry

Which cranial nerve primarily controls the muscles of facial expression?

  1. Hypoglossal nerve
  2. Accessory nerve
  3. Facial nerve Correct answer.
  4. Trigeminal nerve

Explanation

The facial nerve is the seventh cranial nerve and provides the motor supply to the muscles that move the face, including those used in smiling and frowning. Sensation from the face travels mainly on the trigeminal nerve instead.

Question 14Scientific Concepts: Anatomy, Physiology, and Chemistry

Which muscle closes the eyelid?

  1. Occipitalis
  2. Corrugator
  3. Levator palpebrae
  4. Orbicularis oculi Correct answer.

Explanation

The orbicularis oculi is a circular muscle around the eye; when it contracts it squeezes the lids shut and creates crow's feet at the outer corners. Its opposing muscle, the levator palpebrae, lifts the upper lid.

Question 15Scientific Concepts: Anatomy, Physiology, and Chemistry

Contraction of the arrector pili muscle produces which visible effect?

  1. Relaxation of the follicle
  2. Dilation of blood vessels
  3. Hair standing on end Correct answer.
  4. Increased sebum output

Explanation

Each hair follicle has a tiny smooth muscle attached to it. When that muscle contracts, the follicle is pulled upright, producing goosebumps and lifting the hair.

Question 16Scientific Concepts: Anatomy, Physiology, and Chemistry

The subcutaneous layer is composed mainly of:

  1. Collagen bundles
  2. Keratinized cells
  3. Cartilage and bone
  4. Adipose tissue Correct answer.

Explanation

The subcutaneous layer, also called the hypodermis, lies beneath the dermis and is made largely of fat cells plus some connective tissue. This fat cushions the body, insulates it against heat loss, and stores energy.

Question 17Scientific Concepts: Anatomy, Physiology, and Chemistry

An acid is best defined as a substance that:

  1. Absorbs hydrogen ions in water
  2. Raises the pH of a solution
  3. Releases hydrogen ions in water Correct answer.
  4. Releases hydroxide ions in water

Explanation

Acids ionize in water to donate hydrogen ions, which is why acidic solutions have a pH below 7. Bases behave in the opposite way, either releasing hydroxide ions or accepting hydrogen ions.

Question 18Scientific Concepts: Anatomy, Physiology, and Chemistry

A mixture of oil and water that is held together by an emulsifier is called a(n):

  1. Suspension
  2. Solution
  3. Emulsion Correct answer.
  4. Powder

Explanation

Oil and water normally separate, but an emulsifier bridges the two so that one is dispersed throughout the other, forming an emulsion. Many cleansers, lotions, and massage products are built on this principle.

Question 19Scientific Concepts: Anatomy, Physiology, and Chemistry

Surfactants help cleanse the skin by:

  1. Raising the pH of the skin
  2. Increasing sebum production
  3. Adding oil to the skin surface
  4. Lowering water's surface tension Correct answer.

Explanation

Surfactant molecules have a water-loving end and an oil-loving end, so they reduce the surface tension of water and allow oils and debris to lift away into the rinse water. This is why they are the active ingredients in most cleansers.

Question 20Scientific Concepts: Anatomy, Physiology, and Chemistry

Free radicals damage skin cells primarily by:

  1. Oxidizing cellular components Correct answer.
  2. Thickening the dermis
  3. Dehydrating the stratum corneum
  4. Blocking sebaceous glands

Explanation

A free radical is an unstable molecule with an unpaired electron, and it stabilizes itself by stealing electrons from proteins, lipids, and DNA. This oxidation damages cell structures and contributes to premature aging, which is why antioxidants are used to neutralize them.

Question 21Scientific Concepts: Anatomy, Physiology, and Chemistry

Which epidermal cells act as the skin's immune defenders by recognizing and presenting foreign substances?

  1. Langerhans cells Correct answer.
  2. Melanocytes
  3. Merkel cells
  4. Keratinocytes

Explanation

Langerhans cells are specialized dendritic cells scattered in the epidermis that trap antigens and present them to the immune system. This makes them a key part of the skin's role as an immune barrier.

Question 22Scientific Concepts: Anatomy, Physiology, and Chemistry

A solution with a pH of 2 is how many times more acidic than a solution with a pH of 4?

  1. 2 times
  2. 10 times
  3. 100 times Correct answer.
  4. 1000 times

Explanation

The pH scale is logarithmic, and each whole unit represents a tenfold change in hydrogen ion concentration. A difference of two units therefore means 10 x 10, or one hundred times the acidity.

Question 23Scientific Concepts: Anatomy, Physiology, and Chemistry

Vitamin C is important in skin care because it serves as a cofactor in the synthesis of:

  1. Keratin
  2. Sebum
  3. Collagen Correct answer.
  4. Melanin

Explanation

Vitamin C is required for the hydroxylation of proline and lysine during collagen formation, so a deficiency weakens connective tissue and impairs wound healing. This is why it appears both in diets and in topical products aimed at firmness.

Question 24Scientific Concepts: Anatomy, Physiology, and Chemistry

Melanin protects skin cells from ultraviolet damage mainly by:

  1. Absorbing UV energy Correct answer.
  2. Thickening the epidermis
  3. Reflecting all UV light away
  4. Repairing damaged DNA

Explanation

Melanin absorbs ultraviolet radiation and dissipates the absorbed energy, reducing the amount that reaches DNA in the deeper epidermal cells. It does not block all UV, which is why even darker skin can burn with enough exposure.

Question 25Scientific Concepts: Anatomy, Physiology, and Chemistry

Which body system returns excess tissue fluid to the bloodstream and supports immune defense?

  1. Digestive system
  2. Endocrine system
  3. Lymphatic system Correct answer.
  4. Respiratory system

Explanation

Lymphatic vessels collect fluid that has leaked into the tissues and return it to the venous circulation, while lymph nodes house white blood cells that help fight infection. This is why lymphatic drainage techniques are sometimes used in facial massage.

Question 26Scientific Concepts: Anatomy, Physiology, and Chemistry

Which organelle is known as the powerhouse of the cell because it produces most of the cell's ATP?

  1. Golgi apparatus
  2. Nucleus
  3. Ribosome
  4. Mitochondrion Correct answer.

Explanation

Mitochondria carry out cellular respiration, converting nutrients and oxygen into ATP, the energy currency that powers cell metabolism, repair, and division. Organelles such as the nucleus, ribosome, and Golgi apparatus serve other specialized roles.

Question 27Scientific Concepts: Anatomy, Physiology, and Chemistry

Which epidermal layer is the outermost and consists of flattened, keratinized cells that are continually shed?

  1. Stratum spinosum
  2. Stratum corneum Correct answer.
  3. Stratum basale
  4. Stratum granulosum

Explanation

The stratum corneum is the surface layer of the epidermis, made up of dead, keratin-filled cells that flake away and are replaced by cells pushed upward from deeper layers. It forms the skin's primary physical barrier.

Question 28Scientific Concepts: Anatomy, Physiology, and Chemistry

In chemistry, the substance that dissolves another substance to form a solution is called a:

  1. A solvent Correct answer.
  2. A catalyst
  3. A precipitate
  4. A solute

Explanation

A solvent is the dissolving medium, usually the component present in the greater amount, while the substance that is dissolved is the solute. Together they form a solution.

Question 29Scientific Concepts: Anatomy, Physiology, and Chemistry

Which bone forms the lower jaw and is the only freely movable bone of the adult skull?

  1. Mandible Correct answer.
  2. Zygomatic bone
  3. Maxilla
  4. Sphenoid bone

Explanation

The mandible is the lower jawbone; it articulates with the temporal bone at the temporomandibular joint, allowing chewing and speech. The maxilla forms the upper jaw and is fixed.

Question 30Scientific Concepts: Anatomy, Physiology, and Chemistry

Which cells in the dermis are chiefly responsible for producing collagen and elastin fibers?

  1. Fibroblasts Correct answer.
  2. Keratinocytes
  3. Melanocytes
  4. Adipocytes

Explanation

Fibroblasts are the principal connective-tissue cells of the dermis and secrete collagen, elastin, and ground substance that give skin its strength and resilience. Their activity declines with age and sun exposure.

Question 31Scientific Concepts: Anatomy, Physiology, and Chemistry

The acid mantle of healthy skin typically falls within which pH range?

  1. 1.5 to 2.5
  2. 6.5 to 7.5
  3. 8.0 to 9.0
  4. 4.5 to 5.5 Correct answer.

Explanation

Healthy skin surfaces average roughly pH 5, generally within 4.5 to 5.5, because sweat, sebum, and fatty acids form a slightly acidic film. This acidity helps suppress bacteria and supports barrier enzymes.

Question 32Scientific Concepts: Anatomy, Physiology, and Chemistry

How do apocrine sweat glands differ from eccrine sweat glands?

  1. They open directly onto the skin surface through pores
  2. They secrete sebum that lubricates the hair shaft
  3. They are the most numerous glands on the palms and soles
  4. They empty into hair follicles at puberty Correct answer.

Explanation

Apocrine glands are larger glands located deep in the skin whose ducts open into hair follicles; they become active at puberty and are concentrated in the axillae and genital region. Eccrine glands, by contrast, open directly onto the surface and are widespread.

Question 33Scientific Concepts: Anatomy, Physiology, and Chemistry

Which muscle type is involuntary, lacks striations, and forms the walls of blood vessels and the digestive tract?

  1. Skeletal muscle
  2. Striated muscle
  3. Cardiac muscle
  4. Smooth muscle Correct answer.

Explanation

Smooth muscle is controlled by the autonomic nervous system, has no visible striations, and lines hollow organs and vessels. Skeletal muscle is voluntary and striated, while cardiac muscle is striated but involuntary.

Question 34Scientific Concepts: Anatomy, Physiology, and Chemistry

The bond formed when one atom transfers one or more electrons to another atom, creating oppositely charged ions that attract each other, is called:

  1. A hydrogen bond
  2. An ionic bond Correct answer.
  3. A peptide bond
  4. A covalent bond

Explanation

An ionic bond arises from electron transfer, producing a cation and an anion whose opposite charges hold them together. Covalent bonds instead involve shared electrons.

Question 35Scientific Concepts: Anatomy, Physiology, and Chemistry

The actively dividing cells that produce the hair shaft are located in the:

  1. The hair bulb Correct answer.
  2. The medulla
  3. The cuticle
  4. The hair shaft

Explanation

The hair bulb at the base of the follicle encloses the matrix, a region of rapidly dividing cells that build the hair shaft as they are pushed upward. The shaft, cuticle, and medulla are structures formed by this growth rather than its source.

Question 36Scientific Concepts: Anatomy, Physiology, and Chemistry

Water moves across a semipermeable membrane from the side with more water molecules to the side with fewer. This process is called:

  1. Active transport
  2. Diffusion
  3. Filtration
  4. Osmosis Correct answer.

Explanation

Osmosis is the passage of water through a semipermeable membrane toward the side with a higher solute concentration. It requires no cellular energy and is a form of passive transport.

Question 37Scientific Concepts: Anatomy, Physiology, and Chemistry

Which property of water best explains why so many ionic and polar substances dissolve readily in the body's fluids?

  1. Its high boiling point
  2. Its polar molecular structure Correct answer.
  3. Its nonpolar molecular structure
  4. Its low molecular weight

Explanation

Water molecules are polar, with partial charges on the oxygen and hydrogen ends, so they surround and separate charged ions and polar molecules. This attraction is what makes water an effective solvent for body chemistry.

Question 38Scientific Concepts: Anatomy, Physiology, and Chemistry

The intercellular lipid matrix between corneocytes in the stratum corneum primarily serves to:

  1. Anchor the epidermis to the underlying dermis
  2. Bind water in the dermis and give the skin its plumpness
  3. Limit water loss and block entry of foreign substances Correct answer.
  4. Provide nutrients to the dividing cells of the basal layer

Explanation

Ceramides, cholesterol, and fatty acids packed between corneocytes form a mortar-like seal that slows transepidermal water loss and resists penetration by microbes and chemicals. This is the core of the epidermal barrier.

Question 39Scientific Concepts: Anatomy, Physiology, and Chemistry

Which vitamin is a fat-soluble antioxidant that protects cell membranes from damage by free radicals?

  1. Vitamin E Correct answer.
  2. Vitamin A
  3. Vitamin K
  4. Vitamin D

Explanation

Vitamin E is lipid-soluble and sits within cell membranes, where it neutralizes free radicals and limits lipid peroxidation. It is often paired with vitamin C, which helps regenerate it.

Question 40Scientific Concepts: Anatomy, Physiology, and Chemistry

Which division of the nervous system regulates involuntary functions such as gland secretion and dilation of blood vessels?

  1. Somatic nervous system
  2. Central nervous system
  3. Sensory nervous system
  4. Autonomic nervous system Correct answer.

Explanation

The autonomic nervous system controls smooth muscle, cardiac muscle, and glands without conscious effort, adjusting blood flow, sweating, and digestion. The somatic system governs voluntary skeletal muscle movement.

Question 41Safety, Sanitation, and Infection Control

What is the primary goal of sanitation in a salon?

  1. Removing soil and reducing microbes Correct answer.
  2. Sterilizing every nonporous surface
  3. Replacing disinfection with a single wipe
  4. Destroying all bacterial spores on implements

Explanation

Sanitation is the cleaning step that removes visible soil and reduces microbial counts on surfaces and tools. It does not destroy all spores or sterilize items, and it does not replace disinfection with an EPA-registered product.

Question 42Safety, Sanitation, and Infection Control

Which government agency registers disinfectants used in salons?

  1. EPA Correct answer.
  2. CDC
  3. FDA
  4. OSHA

Explanation

The EPA registers disinfectants and reviews label claims such as hospital-grade or tuberculocidal. OSHA enforces workplace safety rules, while the CDC provides infection-control guidance.

Question 43Safety, Sanitation, and Infection Control

How long should you lather your hands with soap and water during routine handwashing?

  1. 60 seconds
  2. 10 seconds
  3. 20 seconds Correct answer.
  4. 5 seconds

Explanation

Routine handwashing should involve lathering with soap and water for at least 20 seconds, including the backs of the hands, between the fingers, and under the nails. This duration helps remove transient microorganisms.

Question 44Safety, Sanitation, and Infection Control

Which item is considered single-use and must be discarded after one client?

  1. Stainless steel scissors
  2. Wooden spatula Correct answer.
  3. Glass mixing dish
  4. Metal extractor

Explanation

Porous items such as wooden spatulas cannot be reliably cleaned and disinfected because liquids do not penetrate them consistently. They must be discarded after a single use.

Question 45Safety, Sanitation, and Infection Control

What information does a Safety Data Sheet (SDS) provide?

  1. A client's medical history and notes
  2. State licensing renewal dates
  3. Hazards, safe handling, and first aid Correct answer.
  4. Disinfection times for every tool

Explanation

An SDS is required by OSHA's Hazard Communication Standard and describes a chemical's hazards, safe handling, personal protective equipment, storage, and first-aid measures. It does not contain client records or licensing information.

Question 46Safety, Sanitation, and Infection Control

How should clean towels be stored in a salon?

  1. In a closed, clean cabinet Correct answer.
  2. In an open bin on the floor
  3. Stacked beside soiled linens
  4. On the treatment table overnight

Explanation

Clean linens should be kept in a closed, clean area away from soiled linens and floor contamination. This prevents cross-contamination before use.

Question 47Safety, Sanitation, and Infection Control

Which of these is a bloodborne pathogen?

  1. Ringworm
  2. Scabies
  3. Hepatitis B Correct answer.
  4. Head lice

Explanation

Hepatitis B, hepatitis C, and HIV are bloodborne pathogens spread through contact with infected blood or body fluids. Ringworm is fungal, scabies is caused by a mite, and head lice are insects.

Question 48Safety, Sanitation, and Infection Control

Which personal protective equipment is most important for protecting the hands from bloodborne pathogens?

  1. Face shield
  2. Apron
  3. Gloves Correct answer.
  4. Goggles

Explanation

Gloves create a barrier that protects the hands from blood and body fluids. Goggles and face shields protect the eyes and face, while an apron protects clothing.

Question 49Safety, Sanitation, and Infection Control

Which medication makes waxing unsafe because the skin may be fragile and tear?

  1. Topical saline
  2. Isotretinoin Correct answer.
  3. Acetaminophen
  4. Vitamin C

Explanation

Isotretinoin increases skin fragility and the risk of tearing, so many estheticians avoid waxing during and after treatment. Acetaminophen, vitamin C, and topical saline do not carry this same skin-thinning risk.

Question 50Safety, Sanitation, and Infection Control

What is the correct way to disinfect a reusable nonporous implement after a client?

  1. Place it in a closed drawer until the next client arrives
  2. Spray with alcohol and reuse once it looks dry
  3. Clean, rinse, dry, and disinfect for the labeled time Correct answer.
  4. Rinse under warm water and wipe with a clean towel

Explanation

Reusable nonporous implements must first be cleaned to remove soil, then rinsed, dried, and immersed in an EPA-registered disinfectant for the full labeled contact time. Cleaning alone or a quick alcohol spray does not meet disinfection requirements.