Question 1

Which of the following best describes the mechanism by which steroid hormones typically exert their effects on target cells?

Accepted Answer

They diffuse through the plasma membrane, bind to intracellular receptors, and activate gene transcription.

Question 2

A patient presents with muscle weakness, dehydration, and low blood pressure. Laboratory tests reveal low aldosterone levels. Which of the following best explains the physiological consequence of aldosterone deficiency?

Accepted Answer

Decreased reabsorption of sodium ions and water in the kidney tubules, leading to decreased blood volume.

Question 3

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

Which of the following is a correct sequence of events for the second-messenger system used by peptide hormones?

Accepted Answer

Hormone binds to receptor → enzyme is activated → second messenger is produced → cellular response occurs

Question 5

A patient with a pituitary tumor has elevated levels of ACTH. Which of the following would most likely be observed as a result?

Accepted Answer

Increased secretion of glucocorticoids from the adrenal cortex

Question 6

Which hormone is primarily responsible for stimulating uterine contractions during childbirth and milk ejection during breastfeeding?

Accepted Answer

Oxytocin

Question 7

Which of the following best explains why drinking alcohol leads to increased urine output?

Accepted Answer

Alcohol inhibits the secretion of antidiuretic hormone (ADH), reducing water reabsorption in the kidneys.

Question 8

Which hormone is secreted by the pineal gland and is involved in regulating the sleep-wake cycle?

Accepted Answer

Melatonin

Question 9

A patient is experiencing symptoms of hyperglycemia. Which hormone is most likely deficient in this patient?

Accepted Answer

Insulin

Question 10

Which of the following best describes the role of negative feedback in hormone regulation?

Accepted Answer

A hormone inhibits its own release once an adequate level is achieved, maintaining homeostasis.

Question 11

Which hormone is released by the adrenal medulla in response to short-term stress and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 12

Which hormone is responsible for stimulating the development of ovarian follicles in females and sperm production in males?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 13

A patient has a tumor that causes excessive secretion of parathyroid hormone (PTH). Which of the following is a likely consequence?

Accepted Answer

Increased blood calcium levels due to increased bone resorption

Question 14

Which hormone is produced by the placenta and is detected by home pregnancy tests?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 15

Which of the following best describes the effect of glucocorticoids during prolonged stress?

Accepted Answer

They increase blood glucose levels and help the body resist long-term stressors.

Question 16

Which hormone is primarily responsible for the development of secondary sex characteristics in males?

Accepted Answer

Testosterone

Question 17

Which of the following is a function of growth hormone (GH)?

Accepted Answer

Promotes growth of skeletal muscle and long bones

Question 18

Which hormone acts as an antagonist to insulin by increasing blood glucose levels, primarily by stimulating the liver to break down glycogen?

Accepted Answer

Glucagon

Question 19

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

Accepted Answer

Endocrine glands secrete hormones directly into the blood; exocrine glands secrete products into ducts.

Question 20

Which hormone is released in response to increased blood glucose levels and promotes the uptake of glucose by most body cells?

Accepted Answer

Insulin

The Endocrine System: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards