Question 1

Which of the following best describes the role of positive feedback in the human body?

Accepted Answer

It amplifies a physiological change, moving the system further from its starting state.

Question 2

A patient presents with severe burns covering the anterior surface of both legs and the anterior trunk. Using the rule of nines, what percentage of the body surface area is affected?

Accepted Answer

$$36\%$$

Question 3

Which of the following is a function of the plasma membrane?

Accepted Answer

Regulates the entry and exit of substances, maintaining cellular homeostasis.

Question 4

Which equation correctly calculates stroke volume ($$SV) in $$cardiac physiology?

Accepted Answer

$$SV = EDV - ESV$$

Question 5

A patient with sickle cell anemia is experiencing severe pain. What is the primary cause of this pain?

Accepted Answer

Obstruction of blood flow due to abnormally shaped red blood cells.

Question 6

Which of the following best explains the difference between isotonic, hypertonic, and hypotonic solutions and their effect on animal cells?

Accepted Answer

In a hypertonic solution, cells lose water and shrink; in a hypotonic solution, cells gain water and may burst; in an isotonic solution, there is no net water movement.

Question 7

Which of the following is NOT a function of calcium in the human body?

Accepted Answer

Acts as a neurotransmitter in synaptic transmission.

Question 8

During endocytosis, which process involves the engulfment of large particles such as bacteria by a cell?

Accepted Answer

Phagocytosis

Question 9

Which hormone is released by the anterior pituitary gland and stimulates the thyroid to produce thyroid hormones?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 10

A hypertensive patient is prescribed an ACE inhibitor. What is the primary reason for this treatment?

Accepted Answer

ACE inhibitors decrease the production of angiotensin II, leading to vasodilation and lower blood pressure.

Question 11

Which of the following best describes the function of surfactant in the lungs?

Accepted Answer

Reduces surface tension in alveoli, preventing collapse during exhalation.

Question 12

Which of the following is a correct description of the cardiac acid-bicarbonate buffer system equation?

Accepted Answer

$$CO_2 + H_2O$$ \leftrightarrow H_2CO_3 \leftrightarrow H^+ + $$HCO_3$$^-$$

Question 13

Which of the following is a function of the nephron's loop of Henle?

Accepted Answer

Creates a concentration gradient in the medulla to facilitate water reabsorption.

Question 14

Which of the following best describes the relationship between agonist and antagonist muscles?

Accepted Answer

Agonist muscles contract to produce movement, while antagonist muscles relax to allow the movement.

Question 15

Which of the following is a correct sequence for the steps of bone repair after a fracture?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 16

Which of the following is a function of the sarcoplasmic reticulum in muscle cells?

Accepted Answer

Stores and releases calcium ions to trigger muscle contraction.

Question 17

Which of the following is a correct description of the function of the hypothalamus?

Accepted Answer

Regulates homeostasis by controlling autonomic and endocrine functions.

Question 18

Which of the following is a correct description of the function of the parathyroid hormone (PTH)?

Accepted Answer

Increases blood calcium levels by stimulating bone resorption.

Question 19

Which of the following is a function of the intercalated discs in cardiac muscle?

Accepted Answer

Allow rapid transmission of electrical impulses between cardiac cells.

Comprehensive Study Guide for Anatomy & Physiology: Key Concepts, Structures, and Functions

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