Class 11 NEET Biology Chemical Coordination and Integration

(A) Thyrocalcitonin (TCT) regulates the blood calcium level.
This is correct. Thyrocalcitonin (or calcitonin) is a hormone produced by the thyroid gland that helps regulate levels of calcium and phosphorus in the blood.
(B) In males, FSH and androgens regulate spermatogenesis.
This is correct. FSH (Follicle Stimulating Hormone) stimulates the Sertoli cells to support spermatogenesis, and androgens (like testosterone) stimulate the development of male secondary sexual characteristics and are also necessary for spermatogenesis.
(C) Hyperthyroidism can lead to goitre.
This is incorrect. Goitre is typically caused by iodine deficiency or thyroid inflammation, not by hyperthyroidism. Hyperthyroidism is a condition where the thyroid gland is overactive and produces too much thyroid hormone.
(D) Glucocorticoids are secreted in Adrenal Medulla.
This is incorrect. Glucocorticoids, such as cortisol, are produced in the adrenal cortex, not the adrenal medulla.
(E) Parathyroid hormone is regulated by circulating levels of sodium ions.
This is incorrect. Parathyroid hormone is regulated by circulating levels of calcium ions, not sodium ions.