Question 1

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

Accepted Answer

The nervous system uses neurotransmitters for communication and has rapid, short-lived effects, while the endocrine system uses hormones and has slower, longer-lasting effects.

Question 2

A patient presents with abnormally high blood glucose levels after a meal. Which hormone is most likely deficient, and what is its primary effect?

Accepted Answer

Insulin; decreases blood glucose by promoting cellular uptake of glucose

Question 3

Which of the following is an example of a positive feedback mechanism in the endocrine system?

Accepted Answer

Release of oxytocin during childbirth and breastfeeding

Question 4

Which hormone is secreted by the anterior pituitary and stimulates the adrenal cortex to release corticosteroids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 5

A tumor destroys the zona glomerulosa of the adrenal cortex. Which hormone would be most affected, and what would be a likely physiological consequence?

Accepted Answer

Aldosterone; impaired sodium retention and low blood pressure

Question 6

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

Accepted Answer

Only cells with the appropriate receptors for that hormone can respond.

Question 7

Which hormone is secreted by the parathyroid glands, and what is its primary function?

Accepted Answer

Parathyroid hormone (PTH); raises blood calcium by stimulating osteoclasts and increasing calcium absorption

Question 8

A patient has a deficiency in antidiuretic hormone (ADH). Which of the following symptoms would you expect?

Accepted Answer

Increased urine output and dehydration

Question 9

Which of the following correctly matches the hormone with its source and primary effect?

Accepted Answer

Melatonin; pineal gland; regulates circadian rhythm

Question 10

Which hormone is produced by the kidneys and stimulates red blood cell production in the bone marrow?

Accepted Answer

Erythropoietin (EPO)

Question 11

A patient is unable to produce thyroid-stimulating hormone (TSH). What would be the expected effect on thyroid hormone (TH) levels and metabolic rate?

Accepted Answer

TH levels would decrease, leading to a lower metabolic rate.

Question 12

Which of the following is a steroid hormone produced by the adrenal cortex?

Accepted Answer

Aldosterone

Question 13

Which hormone is secreted by the heart in response to increased blood volume, and what is its effect?

Accepted Answer

Atrial natriuretic peptide (ANP); increases sodium and water excretion, lowering blood pressure

Question 14

Which of the following best describes the relationship between the hypothalamus and the anterior pituitary?

Accepted Answer

The hypothalamus secretes regulatory hormones into the hypothalamo-hypophyseal portal system to control anterior pituitary hormone release.

Question 15

Which hormone is secreted by the pancreatic alpha cells, and what is its main function?

Accepted Answer

Glucagon; increases blood glucose by stimulating glycogen breakdown in the liver

Question 16

Which of the following is NOT a function of parathyroid hormone (PTH)?

Accepted Answer

Increasing calcium loss in urine

Question 17

A patient with a tumor in the adrenal medulla would most likely experience which of the following symptoms?

Accepted Answer

Increased heart rate and blood pressure due to excess epinephrine and norepinephrine

Question 18

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

Accepted Answer

Melatonin; regulates circadian rhythm and induces drowsiness

Question 19

Which hormone is secreted by the anterior pituitary and stimulates milk production in the mammary glands?

Accepted Answer

Prolactin (PRL)

Question 20

Which of the following best describes the development of the anterior and posterior pituitary glands?

Accepted Answer

The anterior pituitary develops from oral ectoderm (stomodeum), while the posterior pituitary develops from neural tissue of the diencephalon.

The Endocrine System: Structure, Function, and Regulation

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