Biology · 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

The activation of adenylcyclase results in

  1. formation of cAMP

  2. breakdown of cAMP

  3. G-proteins binding to cAMP

  4. entry of steroid hormones into the cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adenylyl cyclase is an enzyme that synthesizes cyclic adenosine monophosphate or cyclic AMP from adenosine triphosphate (ATP).

Multiple choice

Which of the following hormones is not secreted by pituitary gland?

  1. Prolactin

  2. Thyrotropin

  3. Corticotropin

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

Male gonads, or testes, secrete hormones called androgens, the most important of which is testosterone. These hormones regulate body changes associated with sexual development, including enlargement of the penis, the growth spurt that occurs during puberty.

Multiple choice

Which among the following protein complexes enhances Follicle-stimulating hormone, biosynthesis and secretion, and participates in the regulation of the menstrual cycle?

  1. Hyalin

  2. Inhibin

  3. Bindin

  4. Avidin

  5. Activin
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Activin is a protein complex which enhances Follicle-stimulating hormone biosynthesis and secretion, and participates in the regulation of the menstrual cycle. Many other functions have been found to be exerted by activin, including roles in cell proliferation, differentiation, apoptosis, metabolism, homeostasis, immune response, wound repair and endocrine function.

Multiple choice

Which is a hormone?

  1. Insulin

  2. Brain

  3. Ascorbic acid

  4. Nucleic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Insulin is a hormone produced by the pancreas that regulates blood sugar levels by facilitating glucose uptake into cells. Brain is an organ, not a chemical substance. Ascorbic acid is vitamin C, an antioxidant vitamin, not a hormone. Nucleic acids (DNA and RNA) are genetic materials, not hormones.

Multiple choice

Cytokines are involved in

  1. autocrin signalling

  2. major histocomptibality complex

  3. thyroxin

  4. oxytocin

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Autocrine signalling is a form of cell signalling in which a cell secretes a hormone or chemical messenger that binds to autocrine receptors on that same cell.

Multiple choice

The hormones oxytocin and vasopressin are secreted from

  1. posterior pituitary gland

  2. lacrimal gland

  3. parotid gland

  4. periurethral gland

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The posterior pituitary is the posterior lobe of the pituitary gland which is part of the endocrine system.