Free Chemical Coordination And Integration (Daily Quiz: 18) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (b)

Ovary secretes two hormones. Estrogen before ovulation and progesterone after ovulation. Oxytocin, prolaction are pituitary hormones and gonadotropin releasing factor is secreted by hypothalamus of brain to stimulate pituitary for the secretion of gonadotropic hormones.

Answer: (b)

Cholecystokinin and duocrinin are secreted by intestine. It stimulates pancreas to release enzymes in pancreatic juice and stimulates gall bladder to release bile. Duocrinin causes release of viscous mucus from Brunner's glands into intestinal juice.

Answer: (d)

Secondary messengers are low-weight diffusible molecules that are used to relay signals within a cell. They are synthesised or released by specific enzymatic reactions, usually as a result of an external signal that is received by a transmembrane receptor. cAMP, cGMP and $Ca^{2+}$ act as secondary messengers and are located within the cytoplasm. Sodium is an essential nutrient which helps to maintain blood volume and keeps nerves functioning

Answer: (c)

Two hormones viz oxytocin (OT) and antidiuretic hormone (ADH) are synthesised in the hypothalamus, but stored and released by the posterior lobe of pituitary gland.