Question 1

Which of the following best describes the mechanism of action for steroid hormones?

Accepted Answer

They bind to receptors inside the cell, enter the nucleus, and promote transcription of specific genes.

Question 2

A patient is given a synthetic form of cortisol. Which of the following best explains why the maximal effect of this treatment may take several days?

Accepted Answer

Steroid hormones like cortisol act by altering gene transcription, which requires time for new protein synthesis.

Question 3

Which hormone is released by the posterior pituitary and is responsible for stimulating uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 4

Which of the following hormones is produced by the alpha cells of the pancreas and increases blood glucose levels?

Accepted Answer

Glucagon

Question 5

A patient presents with low blood calcium levels. Which hormone would be expected to increase in response?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

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

Accepted Answer

It releases hormones that regulate the activity of the pituitary gland.

Question 7

Which hormone is responsible for moving calcium from the blood into the bone, thereby lowering blood calcium levels?

Accepted Answer

Calcitonin

Question 8

Which of the following is a non-steroid hormone that utilizes a second messenger system to exert its effects?

Accepted Answer

Insulin

Question 9

A researcher blocks the action of adenylate cyclase in a cell. Which hormone's signaling pathway would be most directly affected?

Accepted Answer

Epinephrine

Question 10

Which hormone is secreted by the adrenal cortex and is primarily responsible for regulating sodium and potassium balance in the body?

Accepted Answer

Aldosterone

Question 11

Which of the following best explains why steroid hormones can cross the plasma membrane while non-steroid hormones cannot?

Accepted Answer

Steroid hormones are lipid-soluble, allowing them to diffuse through the lipid bilayer of the plasma membrane.

Question 12

Which hormone is produced by the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 13

A patient with an autoimmune destruction of beta cells in the pancreas would most likely develop which condition?

Accepted Answer

Type 1 diabetes mellitus

Question 14

Which hormone is secreted by the placenta and is commonly used as a marker in pregnancy tests?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 15

Which of the following is a tropic hormone released by the anterior pituitary that stimulates the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 16

Which hormone is released by the thymus and plays a role in the development and maintenance of the immune system?

Accepted Answer

Thymosin

Question 17

A patient is found to have high levels of parathyroid hormone (PTH). Which of the following laboratory findings would you expect?

Accepted Answer

Increased blood calcium levels

Question 18

Which hormone is secreted by the adrenal medulla and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 19

Which of the following best describes the function of gonadotropins released by the anterior pituitary?

Accepted Answer

They regulate the function of the gonads (testes and ovaries).

Question 20

Which hormone is released by the kidneys in response to low oxygen levels and stimulates red blood cell production?

Accepted Answer

Erythropoietin (EPO)

The Endocrine System: Structure, Function, and Hormonal Regulation

Study Guide - Practice Questions