Question 1

Which layer of the epidermis is responsible for the continuous regeneration of skin cells, and what is the primary process occurring there?

Accepted Answer

Stratum basale; mitosis of keratinocytes

Question 2

A patient presents with a deep cut that penetrates through the epidermis and into the dermis. Which structures are most likely to be damaged?

Accepted Answer

Hair follicles, sebaceous glands, and tactile (Meissner’s) corpuscles

Question 3

Which of the following best describes the function of the arrector pili muscle?

Accepted Answer

Contracts to cause hair to stand upright, producing 'goosebumps'

Question 4

Which gland is primarily responsible for thermoregulation and is most numerous on the palms, soles, and forehead?

Accepted Answer

Eccrine (merocrine) sweat gland

Question 5

A histological section of bone reveals concentric rings surrounding a central canal. What is this structure called, and what is its primary function?

Accepted Answer

Osteon (Haversian system); provides structural support and houses blood vessels

Question 6

Which bone structure is responsible for the growth in length of long bones during childhood and adolescence?

Accepted Answer

Epiphyseal plate

Question 7

A patient with a vitamin D deficiency is likely to have impaired function in which bone structure, and why?

Accepted Answer

Trabeculae of spongy bone; decreased calcium absorption leads to weaker bone matrix

Question 8

Which of the following correctly matches the muscle connective tissue layer with its location?

Accepted Answer

Perimysium; surrounds fascicles (bundles of muscle fibers)

Question 9

During muscle contraction, which structure stores and releases calcium ions necessary for contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 10

A mutation that disrupts the formation of the nail matrix would most likely result in which clinical presentation?

Accepted Answer

Impaired nail growth or abnormal nail formation

Question 11

Which of the following best explains why the stratum lucidum is only found in certain areas of the body?

Accepted Answer

It is only present in thick skin, such as the palms and soles, to provide extra protection

Question 12

Which of the following is the correct order of the epidermal layers from deepest to most superficial in thick skin?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 13

A patient suffers a burn that destroys the epidermis and damages the dermis. Which sensory structures are most likely to be affected?

Accepted Answer

Merkel discs and lamellar (Pacinian) corpuscles

Question 14

Which of the following best describes the function of the periosteum in bone?

Accepted Answer

Provides a surface for ligament and tendon attachment and contains osteogenic cells for bone growth and repair

Question 15

Which structure in the hair follicle is responsible for nourishing the growing hair and contains blood vessels?

Accepted Answer

Hair papilla

Question 16

A patient with a genetic defect in collagen synthesis would most likely have abnormalities in which skin layer, and why?

Accepted Answer

Dermis; collagen provides tensile strength and structure

Question 17

Which of the following best describes the role of the sarcolemma in muscle fibers?

Accepted Answer

Acts as the plasma membrane, conducting action potentials along the muscle fiber

Question 18

Which bone marking is most likely to be found at the site of tendon or ligament attachment and is important for leverage and movement?

Accepted Answer

Tuberosity

Question 19

A patient with a blocked sweat gland on the forehead is most likely to experience which physiological effect?

Accepted Answer

Impaired thermoregulation and risk of overheating

Integumentary System, Bone Histology, and Muscle Structure: Study Notes

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