Question 1

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

Accepted Answer

Endocrine glands release hormones directly into the bloodstream, while exocrine glands release their secretions through ducts to a body surface or cavity.

Question 2

A patient is experiencing low blood calcium levels. Which hormone is most likely to be released in response, and what is its primary effect?

Accepted Answer

Parathyroid hormone (PTH); it raises blood calcium levels by stimulating calcium release from bones.

Question 3

Which hormone is produced by the pineal gland, and what is its main function?

Accepted Answer

Melatonin; it regulates the sleep-wake (circadian) cycle.

Question 4

Which of the following scenarios is an example of a neural stimulus triggering hormone release?

Accepted Answer

The sympathetic nervous system stimulates the adrenal medulla to release epinephrine during stress.

Question 5

Which hormone is responsible for stimulating the development and maturation of T lymphocytes, and where is it produced?

Accepted Answer

Thymosin; produced in the thymus gland.

Question 6

A person is experiencing dehydration. Which hormone will be released to help the kidneys conserve water, and where is it stored before release?

Accepted Answer

Antidiuretic hormone (ADH); stored in the posterior pituitary.

Question 7

Which of the following best explains why only certain cells respond to a specific hormone?

Accepted Answer

Only target cells have the specific receptors for that hormone.

Question 8

Which hormone is released in response to high blood glucose levels, and what is its effect?

Accepted Answer

Insulin; it lowers blood glucose by helping cells take in glucose.

Question 9

Which of the following is a lipid-based hormone, and how does it typically affect its target cell?

Accepted Answer

Cortisol; it passes through the cell membrane and activates genes inside the cell.

Question 10

A patient has a tumor destroying their anterior pituitary gland. Which of the following effects would you expect?

Accepted Answer

Decreased growth, reduced thyroid and adrenal activity, and impaired reproductive function.

Question 11

Which hormone is released by the adrenal cortex and is primarily responsible for regulating sodium and water balance?

Accepted Answer

Aldosterone

Question 12

Which hormone is responsible for stimulating milk production, and where is it produced?

Accepted Answer

Prolactin; produced in the anterior pituitary.

Question 13

Which of the following is an example of a hormonal stimulus?

Accepted Answer

The pituitary gland releases TSH, which stimulates the thyroid gland to release thyroid hormones.

Question 14

Which hormone is produced by the testes, and what is one of its main functions?

Accepted Answer

Testosterone; stimulates sperm production.

Question 15

Which hormone lowers blood calcium levels, and how does it achieve this effect?

Accepted Answer

Calcitonin; by promoting calcium storage in bones.

Question 16

Which of the following best describes the role of second messengers in hormone action?

Accepted Answer

They amplify the signal inside the cell after a hormone binds to a membrane receptor.

Question 17

A patient has a deficiency in ADH production. Which of the following symptoms would you expect?

Accepted Answer

Excessive urination and dehydration.

Question 18

Which hormone is produced by the ovaries and is responsible for regulating the menstrual cycle?

Accepted Answer

Estrogen

Question 19

Which of the following is NOT a function of cortisol?

Accepted Answer

Stimulating milk production in the mammary glands.

Question 20

Which hormone is produced by the heart and helps regulate blood pressure?

Accepted Answer

Atrial natriuretic peptide (ANP)

The Endocrine System: Structure, Function, and Major Glands

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