Question 1

Which of the following best describes the difference between the endocrine and nervous systems in terms of their signaling mechanisms?

Accepted Answer

The endocrine system uses hormones for long-distance signaling, while the nervous system uses neurotransmitters for short-distance signaling.

Question 2

A patient presents with symptoms of excessive thirst and large urine output. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes insipidus

Question 3

Which hormone is synthesized from cholesterol, is lipid-soluble, and acts on intracellular receptors to directly activate genes?

Accepted Answer

Cortisol

Question 4

Which of the following best explains the mechanism by which water-soluble hormones (except thyroid hormone) exert their effects on target cells?

Accepted Answer

They bind to plasma membrane receptors and activate second messenger systems such as cAMP.

Question 5

A patient with a pituitary tumor is found to have elevated growth hormone (GH) levels as an adult. Which clinical condition is most likely to develop?

Accepted Answer

Acromegaly

Question 6

Which of the following is an example of a humoral stimulus for hormone release?

Accepted Answer

Low blood calcium levels stimulating parathyroid hormone (PTH) release

Question 7

Which hormone is released in response to stress and hypoglycemia, and acts to increase blood glucose by stimulating gluconeogenesis in the liver?

Accepted Answer

Cortisol

Question 8

A patient with Graves’ disease is likely to present with which of the following symptoms?

Accepted Answer

Elevated metabolic rate, weight loss, and exophthalmos

Question 9

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on blood pressure?

Accepted Answer

ANP decreases blood pressure by inhibiting renin and aldosterone secretion.

Question 10

Which hormone is secreted by pancreatic beta cells and acts to lower blood glucose levels by enhancing glucose uptake into cells?

Accepted Answer

Insulin

Question 11

A patient with hypoparathyroidism after thyroid surgery is most likely to experience which of the following symptoms?

Accepted Answer

Hypocalcemia, muscle tetany, and convulsions

Question 12

Which of the following best describes the concept of 'permissiveness' in hormone interactions?

Accepted Answer

One hormone cannot exert its effects without another hormone being present.

Question 13

Which of the following is a direct effect of growth hormone (GH) on metabolism?

Accepted Answer

Decreasing cellular glucose uptake and increasing blood glucose levels

Question 14

Which hormone is primarily responsible for stimulating the production of red blood cells in the bone marrow?

Accepted Answer

Erythropoietin

Question 15

Which of the following best explains why steroid hormones generally have longer half-lives than peptide hormones?

Accepted Answer

Steroid hormones are bound to plasma proteins, which protects them from rapid degradation.

Question 16

A patient with Cushing’s syndrome is likely to exhibit which of the following laboratory findings?

Accepted Answer

High blood glucose and muscle wasting

Question 17

Which hormone is secreted by the pineal gland and helps regulate circadian rhythms?

Accepted Answer

Melatonin

Question 18

Which of the following best describes the role of osteocalcin secreted by bone?

Accepted Answer

It promotes insulin secretion and improves glucose handling.

Question 19

Which hormone is secreted by the heart in response to high blood volume and acts to decrease blood pressure?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 20

Which of the following is a likely consequence of hypersecretion of adrenal androgens in a prepubertal male?

Accepted Answer

Early appearance of secondary sex characteristics and increased sex drive

The Endocrine System: Structure, Function, and Regulation

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