Question 1

Which of the following best illustrates the relationship between structure and function in connective tissue?

Accepted Answer

Dense parallel collagen fibers in tendons provide strong attachment between muscle and bone.

Question 2

A patient with severe burns has lost both the epidermis and dermal capillaries. Which immediate physiological functions are most impaired?

Accepted Answer

Barrier protection, fluid balance, temperature regulation, and sensation.

Question 3

Which equation correctly describes the relationship between flow ($$F$$), gradient ($$\Delta P$$), and resistance ($$R) in $$physiology?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 4

During intense exercise, muscle ATP concentration remains relatively stable despite massive increases in demand. Which mechanism primarily prevents ATP depletion?

Accepted Answer

Immediate acceleration of ATP resynthesis via phosphocreatine, glycolysis, and oxidative phosphorylation.

Question 5

Which scenario best demonstrates the effect of vessel radius on resistance and flow, according to Poiseuille’s law?

Accepted Answer

A small decrease in vessel radius causes a massive increase in resistance and a large decrease in flow.

Question 6

A drug inhibits the Na$$^+/K$^+-$$ATPase in intestinal epithelial cells. What is the most likely effect on glucose uptake via the SGLT cotransporter?

Accepted Answer

Glucose uptake initially rises but then declines as the Na$$^+$$ gradient is eroded.

Question 7

Which statement best explains why enzymes are required for most physiological reactions?

Accepted Answer

They lower activation energy so reactions can occur fast enough at body temperature.

Question 8

Which equation describes the effect of vessel radius ($$r) on $$resistance ($$R) in $$blood flow?

Accepted Answer

$$R = \frac{8 \eta L}{\pi r^4$}$$

Question 9

Which scenario would most strongly activate glycolysis in a muscle cell?

Accepted Answer

High AMP and falling ATP during intense exercise.

Question 10

A patient with liver disease has reduced plasma albumin. What is the most likely consequence for capillary fluid movement?

Accepted Answer

Decreased plasma oncotic pressure and increased edema.

Question 11

Which statement best describes the effect of competitive antagonists on a dose–response curve?

Accepted Answer

They shift the curve to the right, requiring higher agonist concentration to achieve the same response.

Question 12

Which of the following is a mechanism by which the cell membrane’s fluidity is increased?

Accepted Answer

Presence of unsaturated fatty acid tails in phospholipids.

Question 13

Which process is primarily responsible for the rapid upstroke of the muscle action potential?

Accepted Answer

Opening of voltage-gated Na$$^+$$ channels.

Question 14

Which equation describes the Nernst potential ($$E) $$for an ion with charge $$z$$ and concentrations $$[	ext{ion}]_{	ext{out}}$$ and $$[	ext{ion}]_{	ext{in}}$$?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{out}}}{[	ext{ion}]_{	ext{in}}} ight)$$

Question 15

Which scenario best illustrates hierarchical prioritization in homeostasis?

Accepted Answer

Allowing body temperature to rise during intense exercise to preserve ATP production and muscle blood flow.

Question 16

Which statement best explains why positive feedback is inherently risky in physiological systems?

Accepted Answer

It amplifies change and can become runaway unless a terminating endpoint exists.

Question 17

Which of the following is a real-life example of secondary active transport in human physiology?

Accepted Answer

SGLT cotransporter moving glucose into intestinal cells using the Na$$^+$$ gradient.

Question 18

A patient with type 1 diabetes has impaired insulin secretion. Which part of the homeostatic loop is primarily defective?

Accepted Answer

The effector/output component.

Question 19

Which statement best describes the effect of increased Na$$^+$$ permeability on the resting membrane potential?

Accepted Answer

The membrane potential becomes less negative (depolarization).

ANP Study Guide: Structure-Function, Cell Membranes, Gradients, Metabolism, Communication, and Homeostasis

Study Guide - Practice Questions

Study Guide - Flashcards