Question 1

Which layer of the cutaneous membrane is primarily responsible for storing lipid reserves, and what is its physiological significance in energy metabolism?

Accepted Answer

Hypodermis; it acts as an energy reservoir and insulator.

Question 2

A patient presents with an inability to raise the hairs on their arm in response to cold. Which muscle and nervous system division are most likely affected?

Accepted Answer

Smooth muscle and autonomic nervous system

Question 3

Which epidermal layer is absent in thin skin, and what is its primary function in thick skin?

Accepted Answer

Stratum lucidum; increases protection against abrasion

Question 4

Why do cuts made parallel to skin tension (Langer's) lines heal more efficiently than those made perpendicular?

Accepted Answer

They align with collagen and elastic fibers, reducing gaping

Question 5

Melanin protects the skin from UV radiation by absorbing UV light. Which equation best represents the relationship between melanin concentration ($M$) and DNA damage ($D$)?

Accepted Answer

$D \propto \frac{1}{M}$

Question 6

Which gland type is responsible for producing watery sweat used in thermoregulation, and what is the main component of this secretion?

Accepted Answer

Eccrine gland; water and electrolytes

Question 7

A patient develops calluses on their hands after repeated manual labor. Which physiological process is responsible for this adaptation?

Accepted Answer

Repeated mechanical stress stimulates keratinocyte proliferation

Question 8

A section dividing the body into superior and inferior parts is called a ______ section. Which anatomical plane does this represent?

Accepted Answer

Transverse section; divides top and bottom

Question 9

Pain from the spleen would be felt in which abdominal quadrant, and what is the clinical significance of referred pain?

Accepted Answer

Left upper quadrant; referred pain may indicate shared neural pathways

Question 10

Which bone cell is responsible for bone resorption, and what enzyme does it secrete to degrade bone matrix?

Accepted Answer

Osteoclast; acid phosphatase

Question 11

A child's fracture at the epiphyseal plate is concerning because:

Accepted Answer

It may impair bone growth due to disruption of cartilage proliferation

Question 12

Which joint structure acts as a shock absorber, and what is its composition?

Accepted Answer

Meniscus; fibrocartilage

Question 13

The shoulder joint is more prone to dislocation than the hip because:

Accepted Answer

It sacrifices stability for mobility

Question 14

What type of cartilage is found in intervertebral discs, and what is its primary function?

Accepted Answer

Fibrocartilage; resists compression and absorbs shock

Question 15

Which hormone increases calcium levels in blood by stimulating osteoclast activity, and what is the relevant equation for calcium homeostasis?

Accepted Answer

Parathyroid hormone; $[Ca^{2+}]_{blood} \uparrow$

Question 16

Muscle atrophy after immobilization occurs due to:

Accepted Answer

Reduced motor neuron activity and decreased myofibril synthesis

Question 17

The connective tissue covering individual muscle fibers is called:

Accepted Answer

Endomysium

Question 18

Which muscle fiber type is most resistant to fatigue, and what is its primary energy source?

Accepted Answer

Slow oxidative; aerobic respiration

Question 19

Which structure stores calcium in muscle cells, and what is the role of calcium in muscle contraction?

Accepted Answer

Sarcoplasmic reticulum; releases $Ca^{2+}$ to expose actin binding sites

Question 20

Which glial cell forms the myelin sheath in the peripheral nervous system, and what is the effect of myelination on nerve impulse conduction?

Accepted Answer

Schwann cell; increases conduction speed via saltatory conduction

Anatomy & Physiology: Key Concepts and Systems (BIOB33 Midterm Study Guide)

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