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
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Primary Spermatocyte
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Testosterone hormone
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Leuteinizing Hormone
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Testosterone and Leuteinizing Hormone
B
Correct answer
Explanation
Leydig cells (also called interstitial cells) are specialized cells in the testes that synthesize and secrete testosterone in response to luteinizing hormone (LH) stimulation from the pituitary gland. LH itself is produced by the anterior pituitary gland, not by testicular cells. Primary spermatocytes are germ cells involved in sperm production, not hormone synthesis.
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Thyroxine
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Insulin
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Adrenaline
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Gonadotrophin
B
Correct answer
Explanation
Brockmann body is the main site for insulin synthesis.
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Pancreatic hormone
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Gastric juice
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Insulin
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Parathyroid hormone
D
Correct answer
Explanation
Secretion of parathyroid hormone (PTH) is influenced by serum calcium level.
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By inhalation
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Intravenously
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Intradermally
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Orally
D
Correct answer
Explanation
Epinephrine cannot be given orally because swallowed epinephrine is metabolised by catechol-o-methyltransferase in the wall of the gastrointestinal tract.
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Thyrotropin-releasing factor
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Tuberoinfundibulum (TIDA) neurons
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Luteinising hormone
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Vasoactive intestinal peptide
B
Correct answer
Explanation
Tuberoinfundibulum (TIDA) neurons secrete dopamine that causes inhibition of prolactin secretion.
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Increasing production and release of cortisol
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Stimulating the production and release of melanin
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Increasing uterine contractions
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Regulating development, growth and pubertal maturation
C
Correct answer
Explanation
Oxytocin secreted by posterior pituitary increases the uterine contractions.
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Angiotensin I
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Angiotensin II
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Angiotensin III
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Angiotensin IV
A
Correct answer
Explanation
Angiotensin I is formed by the action of renin on angiotensinogen.
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nor-adrenaline
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adrenaline
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aldosterone
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vasopressin
C
Correct answer
Explanation
Angiotensin stimulates the release of aldosterone from the adrenal cortex.
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SQH (status quo hormone)
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PGH (prothoracic gland hormone)
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GSS (gonad stimulating substance)
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MIS (maturation inducing substance)
D
Correct answer
Explanation
MIS hormone triggers ovulation in starfish.
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Cortisol
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Thyrotropin
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Adrenalin
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Secretin
C
Correct answer
Explanation
Adrenalin is an amino acid derivative. It is secreted by the adrenal medulla.
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Sinus gland
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X-organ
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Y-organ
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Androgenic gland
B
Correct answer
Explanation
Molt inhibiting hormone is produced in X-organ of crustaceans.
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It inhibits the generation of juvenile hormone.
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It stimulates the molting process.
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It aids in egg development.
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It plays a role in the maturation of wings.
D
Correct answer
Explanation
Bursicon plays a prominent role in insect wing maturation during the last step of metamorphosis.
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Metabolism
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Circadian rhythm
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Glycogenolysis
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Lipolysis
B
Correct answer
Explanation
In humans, melatonin affects circadian rhythm.
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Homeostatic function
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Permissive function
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Integrative function
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Morphogenetic function
C
Correct answer
Explanation
Emergence of a new branch neuroendocrinology is due to integrative function of hormones.
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Prostaglandin
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Thromboxane
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Leukotriene
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Prostacyclin
D
Correct answer
Explanation
Prostacyclin inhibits platelet activation and also acts as an effective vasodilator.