Q1: Which of the following is not a steroid hormone? (NEET 2024)
(a) Cortisol
(b) Testosterone
(c) Progesterone
(d) Glucagon
Ans: (d)
Steroid hormones are a class of hormones that are derived from cholesterol and are lipophilic (fat-soluble) in nature. They can easily pass through the cell membranes of target cells to bind with intracellular receptors. Common examples of steroid hormones include cortisol, testosterone, and progesterone, each involved in different regulatory functions in the body.
Cortisol (Option A) is a glucocorticoid hormone produced by the adrenal cortex. It is involved in the regulation of metabolism, immune response, and stress response.
Testosterone (Option B) is an androgen hormone primarily produced in the testes in males and in smaller quantities in the ovaries in females. It plays a key role in developing male reproductive tissues and promoting secondary sexual characteristics such as muscle and bone mass, and the growth of body hair.
Progesterone (Option C) is a hormone released by the ovaries and is important in the regulation of menstruation and maintaining the early stages of pregnancy.
Glucagon (Option D) is fundamentally different from the aforementioned hormones. It is a peptide hormone, not a steroid hormone. Glucagon is produced by the alpha cells of the pancreas and works to raise the concentration of glucose in the bloodstream by promoting gluconeogenesis and glycogenolysis in the liver. Unlike steroid hormones, glucagon does not pass through cell membranes but binds to receptors on the cell surface.
Thus, the correct answer to the question is Option D: Glucagon, as it is not a steroid hormone.
Q2: Match List I with List II :
Choose the correct answer from the options given below : (NEET 2024)
(a) A-I, B-III, C-II, D-IV
(b) A-IV, B-II, C-I, D-III
(c) A-III, B-IV, C-II, D-I
(d) A-III, B-IV, C-I, D-II
Ans: (d)
To solve the matching question, we need to correctly link each disease (List-I) with their corresponding characteristics (List-II). Here is the breakdown of each disease and its effects:
Exophthalmic goiter: Also known as Graves' disease, this is an autoimmune disorder that involves an overactive thyroid (hyperthyroidism) and is characterized by symptoms such as protruding eyeballs. Therefore, this matches with "Hyper secretion of thyroid hormone & protruding eye balls." - from List II (III).
Acromegaly: This condition is caused by excessive secretion of growth hormone, usually from a benign tumor in the pituitary gland, leading to enlarged features (bones, especially in the hands, feet, and face). Thus, it corresponds with "Excessive secretion of growth hormone." - from List II (IV).
Cushing's syndrome: This syndrome is the result of prolonged exposure to high levels of the hormone cortisol. It features symptoms including obesity majorly centered around the abdomen and upper back, moon face, and hyperglycemia. Therefore, it fits "Excess secretion of cortisol, moon face & hyperglycemia." - from List II (I).
Cretinism: This is a condition arising from the deficiency of thyroid hormone in childhood, which causes impaired neurological function, stunted physical growth, and possibly other symptoms. It matches with "Hypo-secretion of thyroid hormone and stunted growth." - from List II (II).
Now, compare these with the available options:
Therefore, the correct answer is Option D.
Q3: Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : (NEET 2024)
Assertion A : FSH acts upon ovarian follicles in female and Leydig cells in male.
Reason R : Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being.
In the light of the above statements, choose the correct answer from the options given below :
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (d)
Sol: Statement Assertion A states that "FSH acts upon ovarian follicles in female and Leydig cells in male." To analyze this, we need to examine the role of FSH (Follicle Stimulating Hormone) in both genders.
In females, FSH indeed acts on ovarian follicles. It stimulates the growth and maturation of these follicles, which is critical for oocyte development and estrogen production. Consequently, FSH plays a fundamental role in the menstrual cycle and fertility in females.
In males, however, FSH acts on the Sertoli cells, not the Leydig cells. The function of FSH in males is to promote spermatogenesis by acting on Sertoli cells in the testes, which support the development of sperm. On the other hand, Leydig cells, influenced by Luteinizing Hormone (LH), are responsible for the production of testosterone, a primary male sex hormone.
Moving on to Reason R, which asserts that "Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being." Both parts of this statement are accurate. In females, the growing ovarian follicles indeed secrete estrogen, pivotal in regulating the female reproductive cycle and secondary sexual characteristics. In males, interstitial cells, another term for Leydig cells, produce androgens, like testosterone, vital for male reproductive functions and characteristics.
Given this, Assertion A is false because its statement about FSH acting on Leydig cells in males is incorrect. However, Reason R is true as it accurately describes hormone secretion by ovarian follicles and Leydig cells in females and males, respectively.
Therefore, the correct answer is: Option D: A is false but R is true.
Q1: Which of the following are NOT under the control of thyroid hormone? (NEET 2023)
A. Maintenance of water and electrolyte balance
B. Regulation of basal metabolic rate
C. Normal rhythm of sleep-wake cycle
D. Development of immune system
E. Support the process of RBCs formation
Choose the correct answer from the options given below:
(a) A and D only
(b) B and C only
(c) C and D only
(d) D and E only
Ans: (c)
Option (C) is the correct answer because thyroid hormones play an important role in the regulation of basal metabolic rate, maintenance of water and electrolyte balance and support the process of RBCs formation, whereas this hormone is not involved in regulating normal rhythm of sleep-wake cycle and development of immune system.
Q1: Which of the following are not the effects of parathyroid hormone? (NEET 2022 Phase 2)
(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:
(a) (B), (D) and (E) only
(b) (A) and (E) only
(c) (B) and (C) only
(d) (A) and (C) only
Ans: (a)
Q2: Give below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): FSH which interacts with membrane bound receptors does not enter the target cell.
Reason (R): Binding of FSH to its receptors generates second messenger (cyclic AMP) for its biochemical and physiological responses.
In the light of the above statements, choose the most appropriate answer from the options given below
(a) (A) is not correct but (R) is correct
(b) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(c) Both (A) and (R) are correct but (R) is not the correct explanation of (A)
(d) (A) is correct but (R) is not correct (NEET 2022 Phase 1)
Ans: (c)
Q5: Erythropoietin hormone which stimulates R.B.C. formation is produced by: (NEET 2021)
(a) The cells of bone marrow
(b) Juxtaglomerular cells of the kidney
(c) Alpha cells of the pancreas
(d) The cells of the rostral adenohypophysis
Ans: (b)
Q1: Match the following columns and select the correct option. (NEET 2020)
Ans: (a)
Grave’s disease is due to excess secretion of thyroid hormones (T3 & T4). Diabetes mellitus is due to hyposecretion of insulin from beta-cells of pancreas. Diabetes insipidus is due to hyposecretion of ADH from posterior pituitary. Addison’s disease is due to hyposecretion of hormone from adrenal cortex.
Q2: Select the correct statement. (NEET 2020)
(a) Insulin acts on pancreatic cells and adipocytes.
(b) Insulin is associated with hyperglycemia.
(c) Glucocorticoids stimulate gluconeogenesis.
(d) Glucagon is associated with hypoglycemia.
Ans: (c)
Glucagon is associated with hyperglycemia. Insulin acts on hepatocytes and adipocytes and is associated with hypoglycemia. Glucocorticoid stimulates gluconeogenesis, so increase blood sugar level.
Q1: How does steroid hormone influence the cellular activities? (NEET 2019)
(a) Using aquaporin channels ‘as second messenger'
(b) Changing the permeability of the cell membrane
(c) Binding to DNA and forming a gene- hormone complex
(d) Activating cyclic AMP located on the cell membrane
Ans: (c)
Hormones which interact with intracellular receptors mostly regulate gene expression or chromosome function by the interaction of hormone receptor complex with the genome.
Q2: Match the following hormones with their respective disease:
(A) Insulin | (i) Addison’s disease |
(B) Thyroxin | (ii) Diabetes insipidus |
(C) Corticoids | (iii) Acromegaly |
(D) Growth hormone | (iv) Goitre |
(v) Diabetes mellitus |
Select the correct option. (NEET 2019)
(A) | (B) | (C) | (D) | |
(a) | (ii) | (iv) | (i) | (iii) |
(b) | (v) | (i) | (ii) | (iii) |
(c) | (ii) | (iv) | (iii) | (i) |
(d) | (v) | (iv) | (i) | (iii) |
Ans: (d)
Q1: Which of the following is an amino acid derived hormone? (NEET 2018)
(a) Epinephrine
(b) Ecdysone
(c) Estradiol
(d) Estriol
Ans: (a)
Epinephrine is derived from amino acid tyrosine by the removal of carboxylic group.
Q2: Which of the following hormones can play a significant role in osteoporosis? (NEET 2018)
(a) Aldosterone and prolactin
(b) Progesterone and aldosterone
(c) Estrogen and parathyroid hormone
(d) Parathyroid hormone and prolactin
Ans: (c)
Estrogen plays a central role in control of bone strength. In a healthy individual, bone mass is maintained by balanced activity of bone forming osteoblasts and bone resorbing osteoclasts. Both these cell types are reported to respond to estrogen. Estrogen promotes the activity of osteoblast and induces osteoclast apoptosis. After menopause the level of this hormone declines. Hence, in an ageing female osteoporosis occurs. Parathormone promotes mobilisation of calcium from bone into blood. Excessive activity of parathormone causes demineralisation of bone leading to osteoporosis.
Q1: GnRH, a hypothalamic hormone, needed in reproduction, acts on (NEET 2017)
(a) Anterior pituitary gland and stimulates secretion of LH and FSH
(b) Posterior pituitary gland and stimulates secretion of oxytocin and FSH
(c) Posterior pituitary gland and stimulates secretion of LH and relaxin
(d) Anterior pituitary gland and stimulates secretion of LH and oxytocin.
Ans: (a)
Gonadotropin releasing hormone (GnRH) is secreted by the hypothalamus which stimulates the anterior lobe of pituitary gland to secrete luteinising hormone (LH) and Follicle Stimulating Hormone (FSH).
Q2: Hypersecretion of growth hormone in adults does not cause further increase in height, because (NEET 2017)
(a) Epiphyseal plates close after adolescence
(b) Bones loose their sensitivity to growth hormone in adults
(c) Muscle fibres do not grow in size after birth
(d) Growth hormone becomes inactive in adults.
Ans: (a)
Epiphyseal plate which is responsible for bone growth close after adolescence so hypersecretion of growth hormone in adults does not cause further increase in height. The epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of a long bone.
Q3: A temporary endocrine gland in the human body is (NEET 2017)
(a) Corpus cardiacum
(b) Corpus luteum
(c) Corpus allatum
(d) Pineal gland.
Ans: (b)
Corpus luteum is the temporary endocrine gland formed in the ovary after ovulation. It release hormones like progesterone, oestrogen etc.
Q1: Graves’ disease is caused due to (NEET 2016 Phase 2)
(a) Hyposecrction of thyroid gland
(b) Hypersecretion of thyroid gland
(c) Hyposecrction of adrenal gland
(d) Hypersecretion of adrenal gland.
Ans: (b)
Exophthalmic goitre or Graves’ disease is a thyroid enlargement (goitre) in which the thyroid secretes excessive amount of thyroid hormone. It is characterised by exophthalmia (protrusion of eye balls because of fluid accumulation behind them), loss of weight, slightly rise in the body temperature, excitability, rapid heart beat, nervousness and restlessness.
Q2: Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilisation. (NEET 2016 Phase 2)
(a) Insulin
(b) Glucagon
(c) Secretin
(d) Gastrin
Ans: (a)
Insulin is a peptide hormone, secreted by the β cells of the islets of Langerhans in the pancreas, that promotes the uptake of glucose by body cells, particularly in the liver (hepatocytes) and muscles (adipocytes) and thereby controls its concentration in the blood.
Q3: The posterior pituitary gland is not a true endocrine gland because (NEET 2016 Phase 2)
(a) It is provided with a duct
(b) It only stores and releases hormones
(c) It is under the regulation of hypothalamus
(d) It secretes enzymes.
Ans: (b)
Posterior lobe of pituitary gland does not secrete any hormone. Its hormones are synthesised by the hypothalamus. It only stores and releases these hormones. Hence, it cannot be considered as true gland.
Q4: Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other? (NEET 2016 Phase 1)
(a) Parathormone – Calcitonin
(b) Insulin – Glucagon
(c) Aldosterone – Atrial Natriuretic Factor
(d) Relaxin – Inhibin
Ans: (d)
Relaxin hormone is secreted by ovary and placenta during pregnancy, which relaxes ligaments in pelvis and softens and widens cervix during childbirth. Inhibin secreted by granulosa cells in the ovaries inhibits secretion of FSH by anterior pituitary. Thus, relaxin and inhibin have different functions and are not antagonistic.
Q5: Changes in GnRH pulse frequency in females is controlled by circulating levels of (NEET 2016 Phase 1)
(a) Estrogen and progesterone
(b) Estrogen and inhibin
(c) Progesterone only
(d) Progesterone and inhibin
Ans: (a)
At the pituitary, GnRH stimulates the synthesis and secretion of the gonadotropins, follicle-stimulating hormone (FSH), and luteinizing hormone (LH). These processes are controlled by the size and frequency of GnRH pulses, as well as by feedback from progesterone and estrogens. Low-frequency GnRH pulses are required for FSH release, whereas highfrequency GnRH pulses stimulate LH pulses in a one to one manner.
Q1: Which one of the following hormones is not involved in sugar metabolism? (AIPMT 2015)
(a) Aldosterone
(b) Insulin
(c) Glucagon
(d) Cortisone
Ans: (a)
Aldosterone is produced by adrenal cortex and plays an important role in the regulation of Na+ and K+ levels in body.
Q2: Which one of the following hormones though synthesised elsewhere is stored and released by the master gland? (AIPMT 2015)
(a) Luteinizing hormone
(b) Prolactin
(c) Melanocyte stimulating hormone
(d) Antidiuretic hormone
Ans: (d)
ADH (Antidiuretic hormone) and oxytocin are produced by hypothalamus and stored in posterior pituitary.
Q3: A chemical signal that has both endocrine and neural roles is? (AIPMT 2015 Cancelled Paper)
(a) Calcitonin
(b) Epinephrine
(c) Cortisol
(d) Melatonin
Ans: (b)
Epinephrine has two role as a hormone and as a neurotransmitter.
Q1: Identify the hormone with its correct matching of source and function: (AIPMT 2014)
(a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands.
(b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle.
(c) Progesterone - corpus-luteum, stimulatiuon of growth and activities of female secondary sex orgAns:
(d) Atrial natriuretic factor - ventricular wall increases the blood pressure.
Ans: (b)
Q2: Fight-or-flight reactions cause activation of: (AIPMT 2014)
(a) The parathyroid glands, leading to increased metabolic rate.
(b) The kidney, leading to suppression of reninangiotensin-aldosterone pathway.
(c) The adrenal medulla, leading to increased secretion of epinephrine and norepinephrene.
(d) The pancreas leading to a reduction in the blood sugar levels.
Ans. (c)
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1. How does chemical coordination play a role in the integration of the human body? |
2. Which glands are responsible for the chemical coordination in the human body? |
3. How do hormones travel in the body to exert their effects on target organs? |
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