Question 1

Which of the following best describes the primary function of hormones in the endocrine system?

Accepted Answer

They serve as messenger molecules that regulate slow processes with widespread effects.

Question 2

Steroid hormones are derived from which molecule?

Accepted Answer

Cholesterol

Question 3

A patient presents with an enlarged thyroid gland (goiter). Which deficiency is most likely responsible for this condition?

Accepted Answer

Iodine

Question 4

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

Accepted Answer

Parathyroid hormone (PTH); increases blood calcium levels

Question 5

Which of the following is a correct pathway for hormonal stimuli in the endocrine system?

Accepted Answer

Hypothalamus secretes hormones → stimulates pituitary → stimulates other glands

Question 6

Which hormone is produced by the posterior lobe of the pituitary gland and is responsible for water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

A patient with hypersecretion of growth hormone (GH) during childhood is likely to develop which condition?

Accepted Answer

Gigantism

Question 8

Which hormone is secreted by pancreatic alpha cells and what is its effect on blood glucose?

Accepted Answer

Glucagon; raises blood glucose

Question 9

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

Accepted Answer

Melatonin; regulates circadian rhythms

Question 10

Which hormone is secreted by the adrenal medulla and is involved in the 'fight-or-flight' response?

Accepted Answer

Epinephrine

Question 11

Which hormone is secreted by the zona glomerulosa of the adrenal cortex and what is its main function?

Accepted Answer

Aldosterone; regulates blood volume and pressure

Question 12

Which hormone is responsible for stimulating the release of glucose from glycogen in the liver?

Accepted Answer

Glucagon

Question 13

Which hormone is produced by the anterior pituitary and stimulates the thyroid gland to release thyroid hormone?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 14

Which hormone is produced by the thymus and is essential for the maturation of T-lymphocytes?

Accepted Answer

Thymic hormones

Question 15

Which hormone is secreted by the heart and helps regulate blood pressure by promoting sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 16

Which hormone is produced by the ovaries and is responsible for maintaining secondary sex characteristics in females?

Accepted Answer

Estrogen

Question 17

Which hormone is produced by the testes and is responsible for the formation of sperm and maintenance of male secondary sex characteristics?

Accepted Answer

Testosterone

Question 18

A patient with hyposecretion of insulin is most likely to develop which condition?

Accepted Answer

Diabetes mellitus

Question 19

Which hormone is produced by the skin and is a precursor to vitamin D?

Accepted Answer

Modified cholesterol molecules

Question 20

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

Accepted Answer

Erythropoietin

Introduction to the Endocrine System

Study Guide - Practice Questions