Question 1

Which hormone is produced by the pineal gland and is primarily responsible for regulating circadian rhythms?

Accepted Answer

Melatonin

Question 2

A patient presents with abnormally high blood calcium levels. Which hormone is most likely being secreted in excess, and what is its primary effect?

Accepted Answer

Calcitonin (CT); stimulates calcium excretion by kidneys

Question 3

Which of the following hormones is derived from the amino acid tyrosine?

Accepted Answer

Thyroid hormones (T3 and T4)

Question 4

What is the primary function of aldosterone, and where is it produced?

Accepted Answer

Stimulates sodium conservation; produced in the zona glomerulosa of the adrenal cortex

Question 5

Which hormone is released by beta cells of the pancreas in response to increased blood glucose levels, and what is its effect?

Accepted Answer

Insulin; accelerates glucose uptake by target cells

Question 6

Which hormone is secreted by the posterior lobe of the pituitary gland and is involved in water reabsorption by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

A patient with Type 1 diabetes mellitus is unable to produce which hormone, and what is the consequence?

Accepted Answer

Insulin; high blood glucose levels

Question 8

Which hormone is produced by the zona fasciculata of the adrenal cortex and has anti-inflammatory effects?

Accepted Answer

Cortisol

Question 9

Which of the following is a lipid-derived hormone that is synthesized from arachidonic acid?

Accepted Answer

Prostaglandins

Question 10

What is the role of G proteins in hormone signaling involving second messengers?

Accepted Answer

They activate adenylate cyclase, which converts ATP to cyclic AMP ($$cAMP)$$

Question 11

Which hormone stimulates the release of thyroid hormones from the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 12

Which hormone is responsible for stimulating the breakdown of glycogen and the release of glucose by the liver during fasting?

Accepted Answer

Glucagon

Question 13

Which hormone is produced by the hypothalamus and stored in the posterior pituitary, and what is its function during childbirth?

Accepted Answer

Oxytocin (OXT); stimulates uterine contractions

Question 14

Which hormone is secreted in response to low blood calcium levels and stimulates osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 15

Which hormone is synthesized as a prohormone and later activated, and is secreted by beta cells in the pancreas?

Accepted Answer

Insulin

Question 16

Which hormone is released by the anterior pituitary and stimulates the production of androgens in males?

Accepted Answer

Luteinizing hormone (LH)

Question 17

Which hormone is responsible for the glucose-sparing effect by stimulating the breakdown of triglycerides in adipocytes?

Accepted Answer

Growth hormone (GH)

Question 18

Which hormone is produced by the adrenal medulla and primarily binds to beta receptors, causing bronchodilation?

Accepted Answer

Epinephrine

Question 19

Which hormone is produced by the heart and helps to reduce blood pressure by promoting sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 20

Which hormone is produced by the kidneys and stimulates red blood cell formation?

Accepted Answer

Erythropoietin (EPO)

The Endocrine System: Structure, Function, and Regulation

Study Guide - Practice Questions