Question 1

Which of the following best describes the difference between negative and positive feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback opposes the original stimulus to maintain balance, while positive feedback amplifies the stimulus, often leading to a specific event.

Question 2

A patient is admitted with metabolic acidosis. Which of the following best explains the role of buffers in the blood in this scenario?

Accepted Answer

Buffers absorb excess hydrogen ions to minimize changes in pH.

Question 3

Which of the following correctly matches the organelle with its primary function?

Accepted Answer

Golgi apparatus – packaging and modifying proteins

Question 4

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

Accepted Answer

It will swell and possibly burst as water enters by osmosis.

Question 5

Which of the following equations correctly represents the breakdown of glucose during aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 6

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Question 7

A patient with a parathyroid tumor is producing excess parathyroid hormone (PTH). Which of the following is a likely consequence?

Accepted Answer

Increased bone resorption leading to elevated blood calcium levels.

Question 8

Which of the following best describes the function of the dorsal root ganglion in the spinal cord?

Accepted Answer

It contains the cell bodies of sensory neurons entering the spinal cord.

Question 9

Which of the following is a correct sequence of events during the action potential of a neuron?

Accepted Answer

Depolarization, repolarization, hyperpolarization, return to resting membrane potential

Question 10

Which of the following best explains why saltatory conduction is faster than continuous conduction in neurons?

Accepted Answer

Action potentials jump from one node of Ranvier to the next, skipping myelinated regions.

Question 11

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulation of body temperature and hunger

Question 12

A patient suffers a third-degree burn over a large area of their body. Which of the following is a major immediate concern?

Accepted Answer

Loss of body fluids leading to dehydration and shock

Question 13

Which of the following best describes the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions change muscle length, while isometric contractions do not change muscle length.

Question 14

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

Accepted Answer

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

Question 15

Which of the following best describes the function of the basal nuclei in the brain?

Accepted Answer

Regulation of voluntary motor movements and procedural learning

Question 16

Which of the following best explains why a deficiency in vitamin D can lead to weakened bones?

Accepted Answer

Vitamin D is necessary for calcium absorption in the intestines, which is essential for bone mineralization.

Question 17

Which of the following best describes the role of troponin and tropomyosin in muscle contraction?

Accepted Answer

They regulate the interaction between actin and myosin by controlling access to binding sites on actin.

Question 18

Which of the following best describes the function of the ascending tracts in the spinal cord?

Accepted Answer

They carry sensory information from the body to the brain.

Question 19

Which of the following is a correct description of the process of endochondral ossification?

Accepted Answer

Bone tissue replaces a cartilage model during fetal development and growth.

Question 20

A patient is unable to flex their forearm at the elbow after a nerve injury. Which of the following best describes the roles of agonist and antagonist muscles in this movement?

Accepted Answer

The agonist (biceps brachii) contracts to produce flexion, while the antagonist (triceps brachii) relaxes.

Comprehensive Study Guide for Anatomy & Physiology (ANP) Final Review

Study Guide - Practice Questions

Study Guide - Flashcards