Question 1

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete substances through ducts to an epithelial surface.

Question 2

A patient is given a synthetic hormone that mimics the action of a natural hormone but binds to the same receptor and blocks the natural hormone's effect. This synthetic hormone is acting as a(n):

Accepted Answer

Antagonist

Question 3

Which of the following best explains why water-soluble hormones generally have a shorter half-life than lipid-soluble hormones?

Accepted Answer

Water-soluble hormones are rapidly degraded by enzymes in the blood and are not protected by carrier proteins.

Question 4

A researcher is studying the cAMP second-messenger mechanism. Which of the following correctly describes a step in this pathway?

Accepted Answer

A hormone binds to a cell surface receptor, activating adenylate cyclase, which converts ATP to cAMP: $$ \mathrm{ATP} \rightarrow \mathrm{cAMP} + \mathrm{PP_i} $$

Question 5

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

Accepted Answer

Parathyroid hormone (PTH) increases blood calcium levels by stimulating osteoclast activity.

Question 6

A patient with a pituitary tumor is experiencing abnormal growth. Which hormone is most likely being overproduced, and what is a key metabolic effect?

Accepted Answer

Growth hormone (GH); increased protein synthesis and lipolysis

Question 7

Which of the following best describes the permissive effect in hormone interactions?

Accepted Answer

One hormone enhances the target organ's response to a second hormone.

Question 8

A patient is found to have low levels of aldosterone. Which of the following would most likely be observed?

Accepted Answer

Decreased sodium reabsorption and decreased blood pressure

Question 9

Which of the following correctly matches a hormone with its chemical classification?

Accepted Answer

Cortisol – steroid hormone

Question 10

Which of the following best describes the role of the hypothalamus in endocrine regulation?

Accepted Answer

It produces releasing and inhibiting hormones that control the anterior pituitary.

Question 11

A patient is experiencing symptoms of hypothyroidism. Which of the following laboratory findings would you expect?

Accepted Answer

Low levels of thyroxine (T4) and high levels of thyroid-stimulating hormone (TSH)

Question 12

Which of the following hormones is produced by the pineal gland and what is its primary function?

Accepted Answer

Melatonin; regulation of circadian rhythms

Question 13

Which of the following best describes the process of gluconeogenesis?

Accepted Answer

The synthesis of glucose from non-carbohydrate precursors such as amino acids and glycerol: $$ 	ext{Amino acids} + 	ext{Glycerol} ightarrow 	ext{Glucose} $$

Question 14

Which of the following is a correct example of a hormone produced by an organ not traditionally considered part of the endocrine system?

Accepted Answer

Erythropoietin produced by the kidneys

Question 15

A patient is given a drug that blocks the action of phosphodiesterase. What effect would this have on the cAMP second-messenger system?

Accepted Answer

It would increase the duration of cAMP signaling by preventing cAMP breakdown.

Question 16

Which of the following best describes the difference between the regulation of anterior and posterior pituitary hormones?

Accepted Answer

Anterior pituitary hormones are regulated by hypothalamic releasing and inhibiting hormones via the hypophyseal portal system, while posterior pituitary hormones are released by direct neural stimulation from the hypothalamus.

Question 17

Which of the following is a correct statement about the synthesis of thyroid hormones?

Accepted Answer

Iodine is actively transported into the thyroid follicular cells and incorporated into tyrosine residues on thyroglobulin.

Question 18

A patient with a parathyroid tumor has elevated blood calcium levels. Which of the following best explains this finding?

Accepted Answer

Excess PTH stimulates osteoclasts to break down bone, releasing calcium into the blood.

Question 19

Which of the following best describes the effect of glucagon on liver metabolism?

Accepted Answer

It stimulates glycogenolysis and gluconeogenesis, increasing blood glucose levels.

Question 20

Which of the following is a correct comparison between lipid-soluble and water-soluble hormones?

Accepted Answer

Lipid-soluble hormones bind to intracellular receptors and often regulate gene expression, while water-soluble hormones bind to cell surface receptors and use second messengers.

Endocrine System: Hormones, Glands, and Regulation – Study Guide

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