Human Physiology – Chemical Coordination and Integration Quiz - ICSE Class 11 Biology

Free practice quiz: Human Physiology – Chemical Coordination and Integration (ICSE Class 11 Biology). 52 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Biology practice quiz has 52 multiple-choice questions on Human Physiology – Chemical Coordination and Integration, and 52 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following hormones is primarily responsible for regulating blood glucose levels by promoting the uptake of glucose from the bloodstream into cells, particularly liver and muscle cells?

   1. Glucagon
   2. Epinephrine
   3. Insulin
   4. Cortisol
   Show answer

   Answer: C. Insulin

   Insulin, secreted by the beta cells of the pancreatic islets, is the primary hormone that lowers blood glucose levels. It achieves this by increasing the permeability of cell membranes to glucose, promoting glycogen synthesis in the liver and muscles, and inhibiting gluconeogenesis.

2. The hormone atrial natriuretic peptide (ANP) is released by the heart and acts to lower blood pressure by promoting sodium and water excretion. This hormone's function is antagonistic to which of the following hormones?

   1. Insulin
   2. Glucagon
   3. Aldosterone
   4. Epinephrine
   Show answer

   Answer: C. Aldosterone

   Aldosterone, secreted by the adrenal cortex, promotes sodium and water reabsorption in the kidneys, thus increasing blood volume and pressure. ANP, released by the heart in response to increased blood pressure, acts to oppose the effects of aldosterone by increasing sodium and water excretion.

3. Which hormone, produced by the hypothalamus and stored and released by the posterior pituitary, stimulates uterine contractions during childbirth and milk ejection during breastfeeding?

   1. Antidiuretic hormone (ADH)
   2. Prolactin
   3. Oxytocin
   4. Luteinizing hormone (LH)
   Show answer

   Answer: C. Oxytocin

   Oxytocin is a hormone produced by the hypothalamus and released by the posterior pituitary. It plays crucial roles in reproduction, specifically in stimulating smooth muscle contractions in the uterus during labor and contractions of the mammary glands to facilitate milk ejection.

4. Goiter, characterized by an enlarged thyroid gland, is most commonly caused by a deficiency of which dietary element, essential for the synthesis of thyroid hormones?

   1. Iron
   2. Calcium
   3. Iodine
   4. Zinc
   Show answer

   Answer: C. Iodine

   Iodine is a critical component in the synthesis of thyroid hormones (thyroxine and triiodothyronine). A lack of iodine in the diet leads to insufficient production of these hormones, which in turn causes the pituitary gland to release more TSH. Chronic TSH stimulation causes the thyroid gland to enlarge, resulting in a goiter.

5. Which hormone produced by the adrenal medulla, while similar to epinephrine, has a greater effect on peripheral vasoconstriction and a lesser effect on cardiac stimulation and metabolic rate?

   1. Dopamine
   2. Norepinephrine
   3. Epinephrine
   4. Serotonin
   Show answer

   Answer: B. Norepinephrine

   Norepinephrine, synthesized and released by the adrenal medulla (along with epinephrine), acts primarily as a vasoconstrictor, increasing blood pressure. While it also has metabolic effects, they are generally less pronounced than those of epinephrine, which is a more potent cardiac stimulant and metabolic activator.

More questions in this quiz

Answers and explanations are in the full quiz.

1. In the context of the adrenal medulla, which neurotransmitter also acts as a hormone, influencing the 'fight-or-flight' response by increasing heart rate, blood pressure, and metabolic rate?
2. Acromegaly, a condition characterized by excessive growth of extremities and facial features in adults, is typically caused by the hypersecretion of which pituitary hormone?
3. Which endocrine gland is responsible for secreting calcitonin, a hormone that plays a role in lowering blood calcium levels by inhibiting osteoclast activity?
4. Myxedema, a condition resulting from insufficient thyroid hormone production in adults, can lead to symptoms such as fatigue, weight gain, and cold intolerance. This is primarily due to a deficiency in which of the following hormones?
5. Which hormone, produced by the posterior pituitary gland, is responsible for regulating water reabsorption in the kidneys, thereby controlling urine volume and blood osmolarity?
6. Cushing's syndrome, characterized by symptoms like hyperglycemia, obesity, and muscle weakness, is often a result of prolonged exposure to high levels of which hormone, typically secreted by the adrenal cortex?
7. Which pair of hormones secreted by the gonads are primarily responsible for the development and maintenance of secondary sexual characteristics in males and females, respectively?
8. The production of melanin, the pigment responsible for skin and hair color, is stimulated by which hormone released from the anterior pituitary gland?
9. Which hormone, produced by the pineal gland, is involved in regulating sleep-wake cycles and is influenced by light exposure?
10. Graves' disease, an autoimmune disorder causing hyperthyroidism, is characterized by the production of antibodies that mimic the action of which pituitary hormone, leading to excessive thyroid hormone production?
11. Which hormone, secreted by the parathyroid glands, is the primary regulator of blood calcium levels, and acts to increase serum calcium by stimulating bone resorption, calcium reabsorption in the kidneys, and vitamin D activation?
12. In males, the Leydig cells in the testes are stimulated by which hormone from the anterior pituitary to produce and secrete testosterone?
13. Diabetes insipidus, a condition characterized by excessive thirst and urination, is often caused by a deficiency in the production or action of which hormone synthesized in the hypothalamus and released by the posterior pituitary?
14. Which of the following endocrine glands produces erythropoietin, a hormone that stimulates the production of red blood cells in the bone marrow?
15. Conn's syndrome, characterized by hypertension and hypokalemia, is caused by the overproduction of which hormone by the adrenal cortex?
16. Which hormone, secreted by the adrenal medulla, plays a role in metabolism and can also increase blood glucose levels, though its effects are generally less potent than epinephrine?
17. The development of ovarian follicles and the production of estrogen in females are primarily regulated by which pituitary hormone?
18. Addison's disease, characterized by symptoms like fatigue, weight loss, and hyperpigmentation, is often caused by insufficient production of hormones from which part of the adrenal gland?
19. The release of digestive enzymes from the pancreas into the duodenum is stimulated by which hormone secreted by the small intestine?
20. Which hormone, produced by the alpha cells of the pancreatic islets, acts antagonistically to insulin by promoting the breakdown of glycogen in the liver and the release of glucose into the bloodstream?
21. Dwarfism, a condition characterized by stunted growth, can be caused by the hyposecretion of which hormone during childhood?
22. Which hormone, secreted by the stomach, stimulates the secretion of gastric acid and pepsinogen, and promotes gastric motility?
23. Which of the following is a steroid hormone produced by the adrenal cortex that plays a crucial role in regulating electrolyte balance, primarily by promoting sodium retention and potassium excretion in the kidneys?
24. The 'stress hormone' cortisol, released by the adrenal cortex in response to ACTH, has numerous metabolic effects. Which of the following is NOT a primary effect of cortisol during prolonged stress?
25. Which hormone, produced by the anterior pituitary, stimulates the adrenal cortex to produce and release glucocorticoids, such as cortisol?
26. In females, the surge of luteinizing hormone (LH) that occurs mid-cycle is critical for triggering which event in the ovarian cycle?
27. Which hormone, released by the adrenal medulla, primarily increases heart rate, blood pressure, and blood glucose levels, preparing the body for immediate action?
28. Which of the following hormones is produced by the thymus gland and plays a crucial role in the maturation and differentiation of T lymphocytes (T cells)?
29. Which hormone, produced by the delta cells of the pancreatic islets, inhibits the release of both insulin and glucagon, and also suppresses the secretion of growth hormone and gastrointestinal hormones?
30. Which hormone, secreted by the heart's atrial walls, antagonizes the effects of aldosterone and angiotensin II by promoting the excretion of sodium and water?
31. An imbalance in which two hormones is most directly implicated in the development of Graves' disease and Hashimoto's thyroiditis, respectively?
32. Which hormone is secreted by the adrenal medulla and plays a minor role in metabolism and vasodilation, but its primary role is in the neuroendocrine regulation of the sympathetic nervous system?
33. Polydipsia (excessive thirst) and polyuria (excessive urination) are hallmark symptoms of both diabetes mellitus and diabetes insipidus. Which of the following is the primary hormonal imbalance responsible for diabetes insipidus?
34. Which hormone, secreted by the adrenal cortex, is a glucocorticoid primarily involved in glucose metabolism, stress response, and immune suppression?
35. In the menstrual cycle, the surge of LH that triggers ovulation is preceded by a rise in estrogen. What is the primary source of this estrogen surge?
36. Which hormone, secreted by the parathyroid glands, is essential for mobilizing calcium from bone and increasing its reabsorption in the kidneys, thereby raising blood calcium levels?
37. Hyperparathyroidism, a condition characterized by excessive parathyroid hormone secretion, often leads to elevated blood calcium levels (hypercalcemia) and can cause kidney stones and bone fragility. This is a direct consequence of overactivity of which hormone?
38. The hormone produced by the alpha cells of the pancreas that counteracts the effects of insulin by raising blood glucose is:
39. Which of the following hormones is produced by the anterior pituitary and stimulates the development of the corpus luteum and the production of progesterone in females?
40. Hyperthyroidism, characterized by increased metabolic rate, weight loss, and heat intolerance, can be caused by excessive production of which hormones?
41. Which of the following hormones is secreted by the adrenal cortex and has a primary role in regulating sodium and potassium balance, thereby influencing blood pressure and fluid volume?
42. The 'fight-or-flight' response is primarily mediated by hormones released from which endocrine structure, acting under sympathetic nervous system stimulation?
43. Which hormone, produced by the hypothalamus and released by the posterior pituitary, is responsible for increasing the reabsorption of water in the kidneys, thus reducing urine output?
44. Which of the following is a neurohormone produced by the hypothalamus that inhibits the release of prolactin from the anterior pituitary?
45. Which hormone, secreted by the corpus luteum after ovulation, prepares the uterus for implantation of a fertilized egg and maintains pregnancy?
46. Hypoglycemia (low blood sugar) is primarily caused by an imbalance in which of the following hormone pairs, where a deficiency of one and an excess of the other would lead to this condition?
47. The regulation of calcium and phosphate metabolism, crucial for bone health and neuromuscular function, is primarily controlled by Parathyroid Hormone (PTH) and which other hormone, which can be synthesized in the skin upon UV exposure?

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