Question 1

Which of the following best describes the main difference in the speed of communication between the nervous system and the endocrine system?

Accepted Answer

The nervous system is faster because it uses action potentials and neurotransmitters, while the endocrine system relies on hormones traveling through the blood.

Question 2

A hormone is released by a gland and travels through the bloodstream to affect distant target cells. What type of signaling is this?

Accepted Answer

Endocrine

Question 3

Which of the following is a correct statement about target cells in the endocrine system?

Accepted Answer

Target cells are defined as cells that possess a receptor that binds a particular hormone.

Question 4

Insulin is a hormone that lowers blood sugar by binding to a receptor on the outside of the target cell. Based on its mechanism, which type of hormone is insulin and why?

Accepted Answer

Amino acid-based because it does not pass through the cell membrane of the target cell.

Question 5

Which of the following best explains why steroid hormones require transport proteins in the blood?

Accepted Answer

Transport proteins stabilize the hormones, so they don't react chemically with the blood.

Question 6

A patient is given a drug that blocks all cell surface hormone receptors. Which hormone's action would be most directly affected?

Accepted Answer

Insulin

Question 7

Which of the following is NOT a function controlled by hormones of the endocrine system?

Accepted Answer

Initiating muscle contraction for reflexes

Question 8

Epinephrine (adrenaline) is released by the adrenal cortex and acts on the heart to increase heart rate during stress. What type of signaling is this?

Accepted Answer

Endocrine

Question 9

Which of the following statements correctly identifies a difference between the endocrine system and other body systems?

Accepted Answer

The organs of most other systems are typically connected or in close proximity, while the endocrine system is distributed throughout the body.

Question 10

A neurotransmitter released at a synapse diffuses across the synaptic cleft and binds to a receptor on the postsynaptic neuron. This is an example of which type of signaling?

Accepted Answer

Paracrine

Question 11

Which of the following best describes the mechanism of action for steroid hormones?

Accepted Answer

They bind to intracellular receptors and directly influence gene expression.

Question 12

Which hormone is most directly involved in regulating electrolyte balance by decreasing urine production and increasing fluid retention?

Accepted Answer

Antidiuretic hormone (ADH)

Question 13

A researcher discovers a new hormone that is lipid-soluble, binds to a receptor inside the target cell, and requires a transport protein in the blood. This hormone is most likely:

Accepted Answer

Steroid

Question 14

Which of the following is a correct pairing of hormone and its primary function?

Accepted Answer

Insulin – lowers blood sugar

Question 15

Which of the following best explains why the stomach is not usually considered an organ of the endocrine system, even though it produces hormones like ghrelin?

Accepted Answer

The stomach's primary function is not hormone secretion, and its hormone release is not as integrated into systemic regulation as classic endocrine glands.

Question 16

Which of the following is a correct statement about the structure and transport of amino acid-based hormones?

Accepted Answer

They are water-soluble and usually circulate freely in the blood.

Question 17

A patient with a deficiency in antidiuretic hormone (ADH) would most likely experience which of the following symptoms?

Accepted Answer

Increased urine production and dehydration

Question 18

Which of the following best describes paracrine signaling?

Accepted Answer

A cell releases a chemical messenger that acts on nearby cells within the same tissue.

Question 19

Which of the following equations best represents the relationship between hormone concentration ($$[H]$$), rate of secretion ($$R_s$$), and rate of removal ($$R_r) in $$the bloodstream at steady state?

Accepted Answer

$$[H] = \frac{R_s}{R_r}$$

Question 20

A patient is found to have a mutation that prevents the synthesis of transport proteins in the blood. Which hormone would be most affected in its ability to reach target cells?

Accepted Answer

Testosterone

Introduction to the Endocrine System: Chemical Messengers and Hormones

Guida di studio - Domande di pratica

Study guide - Flashcard