Question 1

Which of the following best describes the mechanism by which the endocrine system communicates with target cells?

Accepted Answer

Chemical messengers (hormones) distributed via the bloodstream

Question 2

A hormone binds to a G protein-coupled receptor (GPCR) on the cell membrane, activating adenylate cyclase. Which molecule acts as the second messenger in this pathway?

Accepted Answer

cAMP

Question 3

Steroid hormones require a transport protein in the blood because:

Accepted Answer

Steroid hormones are lipid-soluble and do not travel chemically with the blood.

Question 4

Which of the following hormones is NOT released by the anterior pituitary gland?

Accepted Answer

Oxytocin

Question 5

Which statement best explains why second messenger systems can amplify a hormone's effect at low concentrations?

Accepted Answer

Second messenger systems amplify the original hormone signal, allowing it to work at low concentrations.

Question 6

Which of the following is a major difference between the nervous system and the endocrine system?

Accepted Answer

The nervous system uses action potentials and neurotransmitters for fast, localized communication.

Question 7

Insulin operates by activating a receptor on the outside of the target cell. Based on your knowledge of hormone types, insulin is most likely:

Accepted Answer

An amino acid-based hormone because it binds to a receptor on the cell surface.

Question 8

Which hormone is derived from tryptophan and helps regulate circadian rhythms?

Accepted Answer

Melatonin

Question 9

A patient has low levels of thyroid hormone (T$$_3$$), low levels of cortisol, and low levels of estrogen. Which pituitary hormones would you expect to be low?

Accepted Answer

Thyroid stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), and follicle-stimulating hormone (FSH)

Question 10

Which of the following best describes the function of tropic hormones released from the hypothalamus?

Accepted Answer

They stimulate the release of hormones from the anterior pituitary.

Question 11

Which of the following hormones is released by the posterior pituitary gland?

Accepted Answer

Oxytocin

Question 12

Which statement below correctly identifies the difference between the endocrine system and other body systems?

Accepted Answer

The organs of other systems are embryologically linked, while the endocrine organs develop from separate germ layers.

Question 13

Which hormone is NOT produced by the gonads?

Accepted Answer

Prolactin

Question 14

Which of the following best describes the pathway for steroid hormone action?

Accepted Answer

Steroid hormones bind to intracellular receptors and directly interact with DNA.

Question 15

Which of the following hormones is released in response to stress and increases blood glucose levels?

Accepted Answer

Cortisol

Question 16

Which of the following is a function of the hypothalamic-hypophyseal portal system?

Accepted Answer

It carries hormones from the hypothalamus to the anterior pituitary.

Question 17

Which hormone is released by the pancreas and lowers blood glucose levels?

Accepted Answer

Insulin

Question 18

Which of the following best describes the amplification process in a cAMP secondary messenger system?

Accepted Answer

Adenylate cyclase produces many cAMP molecules.

Question 19

Which of the following hormones is released by the adrenal medulla during stressful situations?

Accepted Answer

Epinephrine

Study Guide: The Endocrine System (Anatomy & Physiology)

Study Guide - Practice Questions

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