Endocrine Hypothalamus Pituitary Thyroid

8 MCQs9-step worked example
Source: NCERT Human PhysiologyPYQ coverage: NEET 2022, 2023, 2024, 2025, 2026Official key: NTA-verifiedLast updated: 25 Sep 2026

Endocrine Hypothalamus Pituitary Thyroid, explained for NEET

The hypothalamus-pituitary-thyroid axis fails NEET aspirants in one place: matching a symptom picture to the right gland and the right direction (excess vs deficiency). Two confusions repeat.

First, stunted growth has two unrelated causes. Low growth hormone (GH) from the anterior pituitary gives pituitary dwarfism — proportionate stunting, nothing else (NCERT Class 11 Biology, Chapter 19, page 241). Hypothyroidism in a pregnant mother or developing child gives cretinism — stunted growth plus mental retardation, low IQ, deaf-mutism and abnormal skin (Chapter 19, page 242). Same word ("stunted"), different gland, different hormone.

Second, "goitre" is not one condition. Iodine deficiency starves the thyroid follicles of raw material, so T3/T4 output drops (hypothyroidism), and the gland enlarges trying to compensate — simple goitre (Chapter 19, page 242). Exophthalmic goitre (Graves' disease) is the opposite state: thyroid nodules or cancer push hormone synthesis up, giving enlargement plus protruding eyeballs, raised basal metabolic rate and weight loss — hyperthyroidism (Chapter 19, page 243). An exam option that just says "goitre" without symptoms is deliberately ambiguous.

A third recurring slip sits at the gland-assignment level: the pars distalis (anterior pituitary) makes six hormones — GH, PRL, TSH, ACTH, LH, FSH — while the pars nervosa (posterior pituitary) only stores and releases oxytocin and vasopressin, both actually synthesised by the hypothalamus (Chapter 19, page 241). Swapping a hormone between the two lobes is a common wrong-option pattern.

Watch out: parathyroid hormone (PTH) is hypercalcemic — it raises blood Ca2+ via bone resorption, renal reabsorption and intestinal absorption (Chapter 19, page 243) — a direction some students reverse by conflating it with thyrocalcitonin, which lowers calcium.

Can you answer these Endocrine Hypothalamus Pituitary Thyroid MCQs?

Select an option to see the explanation. Wrong answers show why your choice was tempting — and name the exact trap it exploits.

MCQ 1Easy RecallPractice

Which of the following hormones is secreted by the pars nervosa (posterior pituitary) rather than the pars distalis (anterior pituitary)?

Show answer and why every option is right or wrong

Answer: C. The posterior pituitary (neurohypophysis) only stores and releases oxytocin and vasopressin, both synthesised by the hypothalamus and transported to it; TSH, ACTH and FSH are all anterior pituitary (pars distalis) hormones (NCERT Class 11 Biology, Chapter 19, page 241).

Why A is wrong: A is wrong because TSH is one of the six pars distalis (anterior pituitary) hormones, not a posterior pituitary hormone.

Why B is wrong: B is wrong because ACTH is produced by the anterior pituitary and stimulates adrenal cortex glucocorticoid secretion, not stored in the posterior lobe.

Why D is wrong: D is wrong because FSH is a gonadotrophin made by the anterior pituitary, along with GH, PRL, TSH, ACTH and LH.

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MCQ 2Easy RecallPractice

Which pair of hormones is correctly matched as the two hormones stored and released by the posterior pituitary?

Show answer and why every option is right or wrong

Answer: B. Oxytocin and vasopressin are the two hormones of the neurohypophysis (posterior pituitary); both are actually synthesised by hypothalamic neurons and reach the posterior pituitary via axonal transport before release (NCERT Class 11 Biology, Chapter 19, page 241).

Why A is wrong: A is wrong because growth hormone and prolactin are both pars distalis (anterior pituitary) products, not posterior pituitary hormones.

Why C is wrong: C is wrong because TSH and ACTH are anterior pituitary trophic hormones acting on the thyroid and adrenal cortex respectively.

Why D is wrong: D is wrong because LH and FSH are anterior pituitary gonadotrophins, made in the pars distalis, not stored in the posterior lobe.

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MCQ 3Easy RecallPractice

Which hypothalamic hormone specifically inhibits the release of growth hormone from the pituitary?

Show answer and why every option is right or wrong

Answer: D. Somatostatin, a hypothalamic inhibiting hormone, specifically inhibits release of growth hormone from the pituitary, in contrast to releasing hormones like GnRH which stimulate pituitary hormone release (NCERT Class 11 Biology, Chapter 19, page 240).

Why A is wrong: A is wrong because GnRH is named in the text as a releasing hormone that stimulates gonadotrophin synthesis and release, not an inhibiting hormone.

Why B is wrong: B is wrong because the passage does not name TRH as the growth-hormone inhibitor; it uses somatostatin as its worked example of an inhibiting hormone.

Why C is wrong: C is wrong because CRH is not named as the growth-hormone-inhibiting hormone in this account of hypothalamic hormones.

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MCQ 4Direct ApplicationPractice

A child born to a mother with untreated hypothyroidism during pregnancy shows stunted growth, mental retardation, low intelligence quotient and deaf-mutism. This condition is:

Show answer and why every option is right or wrong

Answer: C. Hypothyroidism during pregnancy causes defective development and maturation of the growing baby, producing stunted growth, mental retardation, low IQ, abnormal skin and deaf-mutism — this combination is specifically named cretinism, distinct from pituitary GH deficiency (NCERT Class 11 Biology, Chapter 19, page 242).

Why A is wrong: A is wrong because pituitary dwarfism results from low GH secretion by the anterior pituitary and produces stunted growth alone, with no mental retardation or deaf-mutism named in the text.

Why B is wrong: B is wrong because gigantism is over-secretion, not deficiency, of growth hormone, and produces abnormal overgrowth, the opposite direction to this case.

Why D is wrong: D is wrong because acromegaly is excess GH secretion in adults causing disfigurement, not a childhood hypothyroid condition.

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MCQ 5Direct ApplicationPractice

A patient presents with an enlarged thyroid gland, protrusion of the eyeballs, raised basal metabolic rate and weight loss. This condition and its underlying hormonal state are:

Show answer and why every option is right or wrong

Answer: B. Exophthalmic goitre is a form of hyperthyroidism characterised by enlargement of the thyroid gland, protrusion of the eyeballs, increased basal metabolic rate, and weight loss, also called Graves' disease (NCERT Class 11 Biology, Chapter 19, page 243).

Why A is wrong: A is wrong because simple (iodine-deficiency) goitre causes hypothyroidism with gland enlargement only — it does not produce eyeball protrusion, raised BMR or weight loss.

Why C is wrong: C is wrong because cretinism is a childhood/foetal hypothyroid condition with stunted growth and mental retardation, not an adult presentation with eyeball protrusion and weight loss.

Why D is wrong: D is wrong because Addison's disease is underproduction by the adrenal cortex causing weakness and fatigue, unrelated to the thyroid gland or eyeball protrusion.

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MCQ 6Direct ApplicationPractice

Parathyroid hormone (PTH) regulates blood calcium by:

Show answer and why every option is right or wrong

Answer: A. PTH is a hypercalcemic hormone: it stimulates bone resorption (demineralisation), stimulates renal tubular reabsorption of Ca2+, and increases Ca2+ absorption from digested food, thereby increasing blood Ca2+ levels (NCERT Class 11 Biology, Chapter 19, page 243).

Why B is wrong: B is wrong because it reverses PTH's direction — PTH stimulates bone resorption (releasing calcium) and increases, not decreases, renal reabsorption of Ca2+.

Why C is wrong: C is wrong because PTH does have a direct, named hypercalcemic action on bone, kidney and gut; thyrocalcitonin works alongside it, not in its place.

Why D is wrong: D is wrong because PTH acts directly on bones and renal tubules, not by stimulating the thyroid gland.

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MCQ 7CalculationPractice

A patient's blood calcium level drops below normal. Which sequence correctly describes the body's corrective hormonal response and its combined mechanism?

Show answer and why every option is right or wrong

Answer: B. Low blood calcium is corrected by PTH from the parathyroid glands acting on three sites at once — bone resorption, renal tubular reabsorption of Ca2+, and intestinal Ca2+ absorption from digested food — all three raising blood Ca2+ together, making PTH a hypercalcemic hormone (NCERT Class 11 Biology, Chapter 19, page 243).

Why A is wrong: A is wrong because thyrocalcitonin is secreted by the thyroid to regulate blood calcium, but the text names PTH, not TCT, as the hormone that raises it via bone resorption; TCT's role is calcium regulation alongside PTH, not a bone-resorption-driven rise.

Why C is wrong: C is wrong because it reverses PTH's actual mechanism: PTH increases, not decreases, renal Ca2+ reabsorption, and stimulates bone resorption (release), not bone deposition.

Why D is wrong: D is wrong because thyroid hormones (T3/T4) are described as regulating basal metabolic rate, RBC formation and carbohydrate/protein/fat metabolism — not as acting directly on bone to control blood calcium; that action belongs to PTH.

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MCQ 8Concept TrapPractice

Which of the following is NOT a documented function of the thyroid hormones T3/T4 themselves, as distinct from thyrocalcitonin (also secreted by the thyroid)?

Show answer and why every option is right or wrong

Answer: C. T3/T4 are described as regulating basal metabolic rate, supporting RBC formation, and controlling carbohydrate/protein/fat metabolism and water-electrolyte balance — raising blood calcium is not among these; that hypercalcemic action belongs to PTH from the parathyroid, while the thyroid's own calcium-related hormone, thyrocalcitonin (TCT), is described only as regulating blood calcium (NCERT Class 11 Biology, Chapter 19, page 243).

Why A is wrong: A is wrong because the text explicitly names basal metabolic rate regulation as a thyroid hormone function.

Why B is wrong: B is wrong because the text explicitly states thyroid hormones support the process of red blood cell formation.

Why D is wrong: D is wrong because the text explicitly states thyroid hormones control metabolism of carbohydrates, proteins and fats.

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How do you solve a Endocrine Hypothalamus Pituitary Thyroid question? A worked example

  1. 1

    Given

    A patient presents with an enlarged thyroid gland, protrusion of the eyeballs (exophthalmos), a raised basal metabolic rate, and unexplained weight loss.

  2. 2

    Required

    Identify the specific thyroid condition and state whether it reflects a hypothyroid or hyperthyroid state.

  3. 3

    Concept

    Thyroid disorders split into two opposite directions: hypothyroidism (deficient hormone synthesis, typically from iodine deficiency, producing simple goitre or, in a developing child, cretinism) and hyperthyroidism (excess hormone synthesis, from thyroid cancer or nodules, producing exophthalmic goitre) (NCERT Class 11 Biology, Chapter 19, pages 242–243).

  4. 4

    Formula

    There is no numeric formula here; the diagnostic rule is symptom-matching against the two named thyroid conditions and their defining feature sets.

  5. 5

    Substitution

    Match each given symptom — enlarged thyroid, eyeball protrusion, raised BMR, weight loss — against the feature list of simple (iodine-deficiency) goitre versus exophthalmic goitre (Graves' disease).

  6. 6

    Calculation

    Simple goitre gives gland enlargement with hypothyroidism only — no eyeball protrusion, no raised BMR, no weight loss are named for it (Chapter 19, page 242). Exophthalmic goitre is explicitly defined as enlargement of the thyroid gland, protrusion of the eyeballs, increased basal metabolic rate, and weight loss — a hyperthyroid state also called Graves' disease (Chapter 19, page 243). All four given symptoms match the exophthalmic-goitre feature set; none is explained by simple goitre.

  7. 7

    Final answer

    The patient has exophthalmic goitre (Graves' disease), a form of hyperthyroidism.

  8. 8

    Common trap

    Treating "goitre" as a single condition and picking simple (iodine-deficiency) goitre by symptom-name alone, missing that the eyeball protrusion, raised BMR and weight loss identify the opposite, hyperthyroid form.

  9. 9

    Similar NEET-style question

    A newborn shows stunted growth, mental retardation, low IQ and deaf-mutism; the mother had untreated hypothyroidism throughout the pregnancy. Which condition does the child have, and how does it differ mechanistically from pituitary dwarfism? (Answer: the child has cretinism, caused by deficient maternal/foetal thyroid hormone (T3/T4) impairing development and maturation — NCERT Chapter 19, page 242 — which is mechanistically distinct from pituitary dwarfism, caused by low growth hormone secretion from the anterior pituitary, page 241; both stunt growth, but only cretinism adds mental retardation and deaf-mutism, since it is a thyroid-hormone deficiency, not a GH deficiency.)

What to remember before solving Endocrine Hypothalamus Pituitary Thyroid questions

Definition

Endocrine Glands and Hormones

Endocrine glands lack ducts and are hence called ductless glands; their secretions are called hormones. The classical definition is a chemical produced by endocrine glands, released into the blood and transported to a distantly located target organ. The current scientific definition is broader: hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. This newer definition covers additional molecules beyond those secreted by organised endocrine glands. Invertebrates possess very simple endocrine systems with few hormones, whereas a large number of chemicals act as hormones and provide coordination in vertebrates. The neural system and the endocrine system jointly coordinate and regulate the physiological functions of the body; neural coordination is fast but short-lived, while hormonal coordination provides continuous regulation to cells not innervated by nerve fibres.

-- NCERT Class 11 Biology, Chapter 19, p. 239
Key Fact

The Hypothalamus

The hypothalamus is the basal part of the diencephalon (forebrain) and regulates a wide spectrum of body functions. It contains groups of neurosecretory cells called nuclei which produce hormones. These hormones regulate the synthesis and secretion of pituitary hormones and are of two types: releasing hormones (which stimulate secretion of pituitary hormones) and inhibiting hormones (which inhibit secretion of pituitary hormones). For example, Gonadotrophin releasing hormone (GnRH) stimulates pituitary synthesis and release of gonadotrophins, while somatostatin from the hypothalamus inhibits release of growth hormone from the pituitary. These hormones originate in hypothalamic neurons, pass through axons, and are released from nerve endings; they reach the pituitary gland through a portal circulatory system and regulate the anterior pituitary. The posterior pituitary is under the direct neural regulation of the hypothalamus.

-- NCERT Class 11 Biology, Chapter 19, p. 240
Key Fact

The Pituitary Gland

The pituitary is in the sella tursica, attached to the hypothalamus by a stalk, and divided into adenohypophysis and neurohypophysis. Adenohypophysis has pars distalis (anterior pituitary), which produces growth hormone (GH), prolactin (PRL), TSH, ACTH, LH and FSH, and pars intermedia, which secretes only melanocyte stimulating hormone (MSH), though in humans pars intermedia is almost merged with pars distalis. Neurohypophysis (posterior pituitary) stores and releases oxytocin and vasopressin, which are synthesised by the hypothalamus and transported axonally. Over-secretion of GH causes abnormal growth leading to gigantism; low GH secretion results in stunted growth called pituitary dwarfism. Excess GH in adults, especially in middle age, causes severe disfigurement of the face called Acromegaly, which may lead to serious complications and premature death if unchecked, and is hard to diagnose in early stages.

-- NCERT Class 11 Biology, Chapter 19, p. 241
Key Fact

The Pineal Gland

The pineal gland is located on the dorsal side of the forebrain. It secretes a hormone called melatonin. Melatonin plays a very important role in the regulation of a 24-hour (diurnal) rhythm of the body; for example, it helps maintain the normal rhythms of the sleep-wake cycle and body temperature. In addition, melatonin also influences metabolism, pigmentation, the menstrual cycle, and defense capability.

-- NCERT Class 11 Biology, Chapter 19, p. 242
Key Fact

Thyroid Gland

The thyroid gland has two lobes on either side of the trachea, interconnected by a thin flap of connective tissue called the isthmus, and is composed of follicles and stromal tissue. Follicular cells synthesise two hormones, tetraiodothyronine or thyroxine (T4) and triiodothyronine (T3). Iodine is essential for the normal rate of hormone synthesis in the thyroid. Deficiency of iodine in the diet results in hypothyroidism and enlargement of the thyroid gland, commonly called goitre. Hypothyroidism during pregnancy causes defective development and maturation of the growing baby leading to stunted growth (cretinism), mental retardation, low intelligence quotient, abnormal skin, and deaf-mutism. In adult women, hypothyroidism may cause the menstrual cycle to become irregular.

-- NCERT Class 11 Biology, Chapter 19, p. 242
Key Fact

Hyperthyroidism and Exophthalmic Goitre

Due to cancer of the thyroid gland or nodule development, the rate of synthesis and secretion of thyroid hormones can increase to abnormally high levels, a condition called hyperthyroidism, which adversely affects body physiology. Exopthalmic goitre is a form of hyperthyroidism characterised by enlargement of the thyroid gland, protrusion of the eyeballs, increased basal metabolic rate, and weight loss; it is also called Graves' disease. Thyroid hormones play an important role in regulating basal metabolic rate, support red blood cell formation, control carbohydrate, protein and fat metabolism, and influence water and electrolyte balance. The thyroid gland also secretes a protein hormone called thyrocalcitonin (TCT), which regulates blood calcium levels.

-- NCERT Class 11 Biology, Chapter 19, p. 243
Key Fact

Parathyroid Gland and Thymus

In humans, four parathyroid glands are present on the back of the thyroid gland, one pair in each lobe. They secrete a peptide hormone called parathyroid hormone (PTH), whose secretion is regulated by circulating calcium ion levels. PTH increases blood Ca2+ levels: it acts on bones to stimulate bone resorption (dissolution/demineralisation), stimulates reabsorption of Ca2+ by renal tubules, and increases Ca2+ absorption from digested food. PTH is thus a hypercalcemic hormone and, along with TCT, plays a significant role in calcium balance. The thymus gland is a lobular structure located between the lungs behind the sternum, on the ventral side of the aorta, and plays a major role in immune system development. It secretes peptide hormones called thymosins, which drive differentiation of T-lymphocytes (cell-mediated immunity) and promote antibody production (humoral immunity). The thymus degenerates in old individuals, weakening immune responses.

-- NCERT Class 11 Biology, Chapter 19, p. 243

Where do students lose marks on Endocrine Hypothalamus Pituitary Thyroid?

These are the exact patterns that cause wrong answers in NEET. Each trap includes when it triggers and how to avoid it.

Trap

GH deficiency vs TSH deficiency dwarfism

Category: Similar Terms

Students confuse pituitary dwarfism (low GH from the anterior pituitary) with cretinism (hypothyroidism in a developing child) since both involve stunted growth.

When it triggers

A question describes 'stunted growth in a child' and offers both 'pituitary dwarfism' and 'cretinism' as options without stating which gland failed.

How to avoid

Low GH secretion causes pituitary dwarfism (C11_BIO_22_FACT_03); hypothyroidism during pregnancy/childhood causing stunted growth is specifically named cretinism, with added mental retardation and deaf-mutism (C11_BIO_22_FACT_05).

Trap

Simple goitre vs exophthalmic goitre

Category: Similar Terms

Students treat 'goitre' as one condition, missing that simple goitre (from iodine deficiency, hypothyroidism) and exophthalmic goitre (Graves' disease, hyperthyroidism) are opposite thyroid states.

When it triggers

A question lists eyeball protrusion and weight loss and asks which thyroid condition it is, with 'goitre' as a distractor answer.

How to avoid

Iodine-deficiency goitre is linked to hypothyroidism (C11_BIO_22_FACT_05); exopthalmic goitre is a form of hyperthyroidism with enlarged thyroid, eyeball protrusion, raised basal metabolic rate and weight loss, also called Graves' disease (C11_BIO_22_FACT_06).

Mistake

Students assign an anterior pituitary hormone (e.g., ACTH) to the posterior pituitary, or vice versa with oxytocin/vasopressin.

Root cause: term confusion

Correction

Anterior pituitary (pars distalis) produces GH, PRL, TSH, ACTH, LH and FSH; pars intermedia secretes MSH. Posterior pituitary (neurohypophysis) only stores and releases oxytocin and vasopressin, which are synthesised by the hypothalamus (C11_BIO_22_FACT_03).

Wrong option pattern

Swaps an anterior-pituitary hormone into a posterior-pituitary option or vice versa

Mistake

Students assume PTH lowers blood calcium (like TCT), or forget which hormone acts on bone resorption versus which lowers calcium.

Root cause: direction ignored

Correction

PTH is a hypercalcemic hormone: it raises blood Ca2+ by stimulating bone resorption, renal tubular reabsorption of Ca2+, and intestinal Ca2+ absorption; thyrocalcitonin (TCT) from the thyroid works with PTH in calcium balance (C11_BIO_22_FACT_07).

Wrong option pattern

States PTH decreases blood calcium or confuses its source gland

More in Human Physiology: 29 exam traps and mistakes · 2 formulas · 1 question pattern from its other lessons.

Endocrine Hypothalamus Pituitary Thyroid questions from past NEET papers

6 questions from NEET 2022, 2023, 2024, 2025, 2026. Answers verified against NTA official keys.

NEET 2024Revised key

Match List I with List II : List - I List – II A. Exophthalmic goiter I. Excess secretion of cortisol, moon face & hypergylcemia. B. Acromegaly II. Hypo-secretion of thyroid hormone and stunted growth. C. Cushing’s syndrome III. Hyper secretion of thyroid hormone & protruding eye balls. D. Cretinism IV. Excessive secretion of growth hormone. Choose the correct answer from the options given below

1A-I, B-III, C-II, D-IV
2A-IV, B-II, C-I, D-III
3A-III, B-IV, C-II, D-I
4A-III, B-IV, C-I, D-II
NTA Answer: Option 4(revised_final)

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NEET 2022

Which of the following are not the effects of Parathyroid hormone? (a) Stimulates the process of bone resorption (b) Decreases Ca2+ level in blood (c) Reabsorption of Ca2+ by renal tubules (d) Decreases the absorption of Ca2+ from digested food (e) Increases metabolism of carbohydrates Choose the most appropriate answer from the options given below:

1(b) and (c) only
2(a) and (c) only
3(b), (d) and (e) only
4(a) and (e) only
NTA Answer: Option 3(final)

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Sources

NCERT refs: Class 11 Biology Chapter 19, p.241

Page numbers are the ones printed in the current NCERT textbook (2023 rationalised edition), unless marked pre-2023. The books are free at ncert.nic.in.

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