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#hormones

101 public questions tagged with this topic.

ZOOLOGY

Which process is responsible for the degradation of maternal hormones, leading to menstruation if no fertilization occur

If fertilization does not occur, the withdrawal of progesterone and estrogen leads to the degeneration of the endometrium and the onset of menstruation.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

Which hormone is responsible for stimulating the secretion of glucocorticoids from the adrenal cortex?

Adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex to release glucocorticoids like cortisol. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which hormone is secreted by the pancreas and acts to increase blood glucose levels?

Glucagon, secreted by the pancreas, increases blood glucose levels by promoting glycogen breakdown. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

During the first trimester of pregnancy, which structure is the main source of progesterone?

In early pregnancy, the corpus luteum is the primary source of progesterone until the placenta takes over later in gestation. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

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ZOOLOGY

Which hormone is secreted by the hypothalamus and inhibits the release of growth hormone?

Somatostatin, secreted by the hypothalamus, inhibits the release of growth hormone from the pituitary gland. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which hormone is responsible for stimulating the adrenal cortex to produce cortisol?

ACTH stimulates the adrenal cortex to secrete cortisol, which helps in metabolism and stress response. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

Which hormone is responsible for stimulating the adrenal cortex to produce cortisol?

ACTH, secreted by the anterior pituitary, stimulates the adrenal cortex to produce cortisol. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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CHEMISTRY

The hormone that promotes sodium reabsorption in the kidneys is:

Aldosterone, a mineralocorticoid from the adrenal cortex, enhances sodium reabsorption in the distal tubules. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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Sex determination-l

Leydig cells in mammals produce:

Leydig cells originate from mesenchymal progenitors in interstitial compartment under Desert hedgehog signaling from Sertoli cells and transcription factor Sf1. They express steroidogenic acute regulatory protein and enzymes Cyp11a1, Hsd3b1, Cyp17a1 converting cholesterol to testosterone. Their principal product testosterone secreted in fetal life stabilizes Wolffian ducts differentiating into seminal vesicles, epididymis and vas deferens, supports masculinization of brain and later promotes spermatogenesis. Testosterone also serves as precursor for dihydrotestosterone in external genitalia and estradiol in brain. Insufficient function causes female phenotype.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 17: Leydig cells produce testosterone in fetal testis.

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