Question 1

Which of the following best describes the role of negative feedback mechanisms in maintaining homeostasis in the human body?

Accepted Answer

They reverse a change in a controlled condition to restore balance.

Question 2

A patient is found to have blue-toned skin (cyanosis). What does this most likely indicate about their physiological state?

Accepted Answer

They have low oxygen saturation in their blood.

Question 3

Which of the following best explains why the thoracic cavity provides more protection to its organs than the abdominal cavity?

Accepted Answer

The thoracic cavity is surrounded by both bone (ribs, sternum, vertebrae) and muscle, while the abdominal cavity is protected mainly by muscle.

Question 4

Which of the following is a property of water that is essential for regulating body temperature during sweating?

Accepted Answer

High heat of vaporization, which allows the body to lose heat as sweat evaporates.

Question 5

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and why?

Accepted Answer

It will swell and possibly burst because water will move into the cell.

Question 6

Which vitamin is fat-soluble, produced by the skin upon exposure to UV radiation, and is essential for normal bone growth and function?

Accepted Answer

Vitamin D

Question 7

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete substances onto epithelial surfaces via ducts.

Question 8

Which of the following best explains why most human cancers are carcinomas or adenocarcinomas?

Accepted Answer

Epithelial tissues are exposed to environmental factors and have a high rate of cell division, increasing the risk of mutations.

Question 9

Which of the following best describes the function of the sodium-potassium pump in human cells?

Accepted Answer

It maintains the resting membrane potential by actively transporting sodium out and potassium into the cell.

Question 10

Which of the following is a correct sequence of the five layers of the epidermis from superficial to deep in thick skin?

Accepted Answer

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

Question 11

A patient with impaired cilia in their respiratory tract is at increased risk for infection. Why?

Accepted Answer

Cilia help move mucus and trapped pathogens out of the respiratory tract; without functioning cilia, pathogens remain and can cause infection.

Question 12

Which of the following best describes the effect of antacids on stomach pH?

Accepted Answer

Antacids neutralize stomach acid, raising the pH toward neutrality.

Question 13

Which of the following is a function of keratinocytes in the epidermis?

Accepted Answer

They secrete keratin, which helps prevent water loss from the body.

Question 14

Which of the following best describes the composition of the extracellular matrix in connective tissue?

Accepted Answer

It is composed of ground substance and protein fibers such as collagen, elastic, and reticular fibers.

Question 15

Which of the following best explains why the creation of chemical bonds consumes energy, while breaking bonds releases energy?

Accepted Answer

Bond formation requires input of energy to bring atoms together, while breaking bonds releases stored energy.

Question 16

Which of the following is an example of a positive feedback mechanism in the human body?

Accepted Answer

Blood clotting, where the process accelerates until the clot is formed.

Question 17

Which of the following best describes the difference between facilitated diffusion and active transport across the plasma membrane?

Accepted Answer

Facilitated diffusion moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using ATP.

Question 18

Which of the following best explains why profuse sweating is both beneficial and potentially problematic on a hot day?

Accepted Answer

Sweating cools the body by evaporation but can lead to dehydration if fluids and electrolytes are not replaced.

Question 19

Which of the following best describes the function of gap junctions in tissues?

Accepted Answer

They allow direct communication between adjacent cells by permitting the passage of ions and small molecules.

Question 20

Which of the following best explains why the myocardium (heart muscle) contains a high number of mitochondria?

Accepted Answer

The myocardium requires large amounts of ATP for continuous contraction.

ANP College Course Study Guide: Step-by-Step Guidance for Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards