Question 1

Which of the following best describes the principle of homeostasis in human physiology?

Accepted Answer

The maintenance of a stable internal environment despite changes in the external environment.

Question 2

A patient presents with a dangerously high blood glucose level. Which feedback mechanism is most likely to be activated to restore homeostasis, and why?

Accepted Answer

Negative feedback, because it reduces the deviation from the set point by triggering insulin release.

Question 3

Which of the following is NOT a component of a typical feedback loop?

Accepted Answer

Gradient

Question 4

In childbirth, uterine contractions cause the release of oxytocin, which increases the strength of contractions. This is an example of:

Accepted Answer

Positive feedback, because the response amplifies the original stimulus.

Question 5

Which of the following best illustrates the relationship between structure and function in anatomy and physiology?

Accepted Answer

The thin walls of alveoli in the lungs facilitate rapid gas exchange.

Question 6

A patient is unable to sweat due to a genetic disorder. Which core principle is most directly disrupted, and what is a likely consequence?

Accepted Answer

Homeostasis; the patient may overheat because they cannot regulate body temperature.

Question 7

Which of the following best defines a gradient in physiology?

Accepted Answer

A difference in a variable (such as concentration, pressure, or temperature) between two regions that drives movement.

Question 8

Which scenario best demonstrates the necessity of cell-to-cell communication in a multicellular organism?

Accepted Answer

Coordinated contraction of cardiac muscle cells to produce a heartbeat.

Question 9

A patient with severe dehydration has a higher solute concentration in their blood plasma than in their cells. Which type of gradient is primarily involved, and what is the likely direction of water movement?

Accepted Answer

Osmotic gradient; water will move out of the cells into the plasma.

Question 10

Which of the following equations best represents the concept of a gradient in physiology?

Accepted Answer

$$ \Delta C = C_2$ - C_1$ $$

Question 11

A patient’s blood pressure drops suddenly. Which of the following best explains how the body responds to restore homeostasis?

Accepted Answer

Baroreceptors detect the change, the brain increases heart rate, and blood pressure rises via negative feedback.

Question 12

Which of the following is a real-life example of negative feedback?

Accepted Answer

Regulation of blood glucose by insulin and glucagon.

Question 13

Which statement best explains why negative feedback is more common than positive feedback in maintaining homeostasis?

Accepted Answer

Negative feedback opposes changes, keeping variables within a narrow range.

Question 14

A patient with a spinal cord injury cannot sense changes in body temperature. Which component of the feedback loop is most likely impaired?

Accepted Answer

Receptor

Question 15

Which of the following best describes how structure and function are related in the nephron of the kidney?

Accepted Answer

The long, coiled tubule increases surface area for reabsorption of water and solutes.

Question 16

Which of the following is an example of cells communicating to coordinate a physiological response?

Accepted Answer

Neurons releasing neurotransmitters to stimulate muscle contraction.

Question 17

A patient is given a drug that blocks the action of effectors in a feedback loop. What is the most likely outcome?

Accepted Answer

The body cannot carry out the response needed to restore homeostasis.

Question 18

Which of the following best illustrates the application of physiological mechanisms to predict a patient’s presentation?

Accepted Answer

A patient with excessive aldosterone secretion will present with high blood pressure due to increased sodium and water retention.

Question 19

Which of the following is the best justification for why an intervention that blocks sodium channels in neurons would affect muscle contraction?

Accepted Answer

Blocking sodium channels prevents action potentials, so signals cannot reach muscles to trigger contraction.

Question 20

A patient is exposed to a toxin that disrupts the control center in a feedback loop. Which of the following best predicts the outcome?

Accepted Answer

The body cannot process information from receptors or coordinate a response.

Chapter 1: Introduction to Anatomy and Physiology – Core Principles and Homeostasis

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