Question 1

Which of the following best describes the negative feedback loop involved in blood glucose regulation after a meal?

Accepted Answer

Insulin is released by the pancreas, causing cells to take up glucose, lowering blood glucose levels.

Question 2

Which of the following is an example of a positive feedback loop in human physiology?

Accepted Answer

Blood clotting cascade, where each step amplifies the next until clot formation is complete.

Question 3

Which neurotransmitter is primarily responsible for stimulating skeletal muscle contraction at the neuromuscular junction?

Accepted Answer

Acetylcholine

Question 4

Which of the following best describes the effect of GABA (gamma-aminobutyric acid) on postsynaptic neurons?

Accepted Answer

GABA increases chloride ion influx, causing hyperpolarization and inhibiting action potential generation.

Question 5

Which spinal reflex is responsible for quickly withdrawing your hand from a hot surface, and what is its pathway?

Accepted Answer

The flexor (withdrawal) reflex, which involves sensory neurons activating interneurons in the spinal cord that stimulate motor neurons to contract flexor muscles.

Question 6

Which of the following structures is part of the central nervous system (CNS)?

Accepted Answer

Spinal cord

Question 7

Which of the following is classified as white matter in the nervous system?

Accepted Answer

Myelinated axons in the corpus callosum

Question 8

Which lobe of the cerebrum contains the primary visual cortex?

Accepted Answer

Occipital lobe

Question 9

Which of the following responses is characteristic of the sympathetic nervous system?

Accepted Answer

Increased heart rate and dilation of bronchioles

Question 10

Which structure is responsible for processing auditory information?

Accepted Answer

Temporal lobe

Question 11

Which receptor is associated with the sense of smell?

Accepted Answer

Olfactory receptor

Question 12

Which hormone is released from the adrenal medulla?

Accepted Answer

Epinephrine

Question 13

Which hormone targets the kidneys to increase water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Question 14

Which hormone is best described as increasing blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 15

During the cardiac cycle, which stage is characterized by ventricular contraction and ejection of blood?

Accepted Answer

Ventricular systole

Question 16

Which of the following best differentiates red blood cells (RBCs) from white blood cells (WBCs)?

Accepted Answer

RBCs lack nuclei and are specialized for oxygen transport, while WBCs have nuclei and are involved in immune defense.

Question 17

Which equation best represents the relationship between blood pressure ($$BP$$), cardiac output ($$CO$$), and total peripheral resistance ($$TPR$$)?

Accepted Answer

$$BP = CO 	imes TPR$$

Question 18

A patient with high blood pressure is found to have elevated levels of aldosterone. Which of the following best explains how aldosterone affects blood pressure?

Accepted Answer

Aldosterone increases sodium reabsorption in the kidneys, leading to increased water retention and higher blood volume, which raises blood pressure.

Question 19

Which of the following best describes the direct connection between the endocrine and nervous systems in regulating heart rate?

Accepted Answer

The adrenal medulla releases epinephrine in response to sympathetic nervous stimulation, increasing heart rate.

Question 20

Which neurotransmitter is released by postganglionic neurons of the sympathetic nervous system to increase heart rate?

Accepted Answer

Norepinephrine

Anatomy & Physiology Study Guide: Feedback Loops, Nervous & Endocrine Systems, Cardiac Cycle, and More

Study Guide - Practice Questions

Study Guide - Flashcards