Biology · General Awareness

Human Endocrine System

1,395 Questions

The human endocrine system comprises glands that secrete hormones to regulate bodily functions like metabolism, growth, and reproduction. Competitive exams frequently test the specific roles of hormones such as adrenaline, insulin, and progesterone. Use these questions to master the locations and functions of different hormones.

Hormone functionsIslets of LangerhansFight or flight responseBlood pressure regulationFemale sex hormonesWater soluble hormones

Human Endocrine System Questions

Multiple choice

Which hormone is responsible for ovulation?

  1. LH

  2. Testosterone

  3. Estrogen

  4. FSH
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Estrogen levels peak towards the end of the follicular phase, which causes a surge in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This lasts from 24 to 36 hours, and results in the rupture of the ovarian follicles, causing the oocyte to be released from the ovary via the oviduct.

Multiple choice

What is hormone?

  1. Organic complex substances

  2. Chemical messenger

  3. Glandular secretion

  4. Blood cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A hormone is class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behavior.

Multiple choice

Which hormone helps to maintain the balance of salts and water in the blood?

  1. Cortisol

  2. Calcitonin

  3. Testosterone

  4. Aldosterone
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It plays a central role in the regulation of blood pressure mainly by acting on the distal tubules and collecting ducts of the nephron, increasing reabsorption of ions and water in the kidney, to cause the conservation of sodium, secretion of potassium, increase in water retention, and increase in blood pressure and blood volume.

Multiple choice

Which of the following flows directly into blood?

  1. Enzyme

  2. Hormone

  3. Minerals

  4. Proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hormones are secreted by glands with the help of ducts at specific sites or directly pour their secretions in into the blood. Enzymes are only secreted at their site of action.

Multiple choice

Testes produce ______ hormone.

  1. Estrogen

  2. Testosterone

  3. Progesterone

  4. Both estrogen and testosterone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Estrogen and progesterone are produced by ovary.

Multiple choice

The female sex hormone estrogen is produced by

  1. germinal epithelium

  2. zona pellucida

  3. corpus allbicans

  4. cells of graafian follicle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The female sex hormone estrogen is produced by cells of graafian follicle.  Graffian Follicle is a fluid-filled structure in the mammalian ovary within which an ovum develops prior to ovulation.

Multiple choice

In an experiment, luteinising hormone is injected into the body of adult males. What do you expect?

  1. More of testosterone is produced

  2. Less of testosterone is produced

  3. There is no effect on the production of testosterone

  4. Sperm production will increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When luteinizing hormone is injected into the body of adult males, more of testosterone is produced because testosterone produced is under the control of luteinizing hormone.

Multiple choice

The hormone progesterone is secreted by

  1. developing graafian follicles

  2. corpus luteum

  3. the entire ovary

  4. Leydig cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The hormone progesterone is secreted by developing graafian follicles.

Multiple choice

Prohormones are

  1. active form of hormones

  2. inactive form of hormones

  3. Both (1) and (2)

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Prohormones are inactive form of hormones.  Though not hormones themselves, prohormones amplify the effects of existing hormones.