Biology ยท General Awareness

Human Endocrine System

1,530 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

What are the products of the endocrine gland?

  1. enzymes

  2. hormones

  3. ions

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

Endocrine glands are ductless glands that secrete chemical messengers called hormones directly into the bloodstream to regulate distant target organs and tissues.

Multiple choice

Which hormone is called as Fight and Flight hormone?

  1. Insulin

  2. Adrenalin

  3. Vasopressin

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

Adrenaline (epinephrine) is known as the 'fight or flight' hormone. It is released by the adrenal glands in response to stress or danger, rapidly preparing the body to either confront the threat or flee.

Multiple choice

Which cells will secrete Insulin hormone ?

  1. Podocytes

  2. Ilets of Langerhans

  3. Neurons

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

Insulin is secreted by the beta cells located in the Islets of Langerhans, which are the endocrine regions of the pancreas.

Multiple choice

Which is the male sex hormone ?

  1. Estrogen

  2. Testosterone

  3. Thyroxin

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

Testosterone is the primary male sex hormone (androgen) produced by the testes. It regulates male reproductive development, sperm production, and secondary sexual characteristics like facial hair and muscle mass.

Multiple choice

Which hormone would be secreted just after labour and the birth of a baby?

  1. Oxytocin

  2. Prolactin

  3. Adrenalin

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

Prolactin is secreted by the anterior pituitary gland to stimulate milk production (lactation) in the mammary glands after childbirth. While oxytocin is crucial during labor for uterine contractions, prolactin is specifically responsible for the synthesis of milk following birth.

Multiple choice

Oxytocin is released by...

  1. the pineal gland

  2. the testes

  3. the pituitary

  4. the adrenal glands
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxytocin is produced in the hypothalamus and stored and released by the posterior pituitary gland.

Multiple choice

Hormones released by the ovaries

  1. Glucagon

  2. Estrogen

  3. Oxytocin

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

Estrogen and progesterone are the primary hormones produced and released by the ovaries in females.

Multiple choice

What is the function of the melatonin?

  1. It secretes a group of hormones called cortocosteroids

  2. It increases blood glucose levels

  3. It regulates rest activity, menstrual and sleep cycles

  4. It stimulates hormone secretions in other endocrine glands
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Melatonin is produced by the pineal gland and plays a key role in regulating sleep-wake cycles (circadian rhythms) and other biological rhythms.

Multiple choice

What does growth hormone stimulate?

  1. Growth, cell division and skin regeneration.

  2. Growth, cell respiration and cell reproduction.

  3. Growth, cell reproduction, and cell regeneration

  4. Growth, cell regeneration and increase of body mass
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Growth hormone (somatotropin) stimulates growth, cell reproduction, and cell regeneration in humans and other animals.

Multiple choice

What system does the endocrine system send its hormones to?

  1. Nervous system

  2. Digestive system

  3. Circulatory system

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

Endocrine glands secrete hormones directly into the bloodstream (circulatory system), which carries them to target organs throughout the body.

Multiple choice

What do the endocrine glands secrete?

  1. Neurotransmitters

  2. Releasing factors

  3. Hormones

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

Endocrine glands are specialized organs that synthesize and secrete chemical messengers called hormones directly into the bloodstream.

Multiple choice

What is the endocrine system?

  1. It is a non secretory-system

  2. It is a coordination and control system

  3. It is a secretory and nervous system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The endocrine system is a major regulatory system of the body, working alongside the nervous system to coordinate and control physiological processes through hormones.

Multiple choice

During pregnancy which hormones stimulate (i) milk production (ii) milk ejection?

  1. (i) Oxytocin (ii) Prolactin

  2. (i) Estrogen (ii) Prolactin

  3. (i) Prolactin (ii) Oxytocin

  4. (i) Prolactin (ii) Estrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Prolactin stimulates the mammary glands to produce milk, whereas oxytocin stimulates the contraction of myoepithelial cells to cause milk ejection. Estrogen helps prepare the breasts for lactation during pregnancy but does not directly stimulate milk production or ejection.