Which one of the following four secretions is correctly matched wwith its source, target and nature of action?

Answer

d

Explanation

Gastrin is a polypeptide hormone produced by the entroendocrine cells of the stomach after exposure to mechanical stimuli or stimulation of vagus nerve and of the duodenum, after the exposure of chyme that contains undigested proteins. It play an important role in the control of gastric acid secretion. Inhibin hormone is seccreted from corpus luteum, placenta and lestes. It supplements the effect of excess sex hormones for depressing gondotrophic activity (FSH, LH, ICSH). The target of inhibin is anterior lobe of pituitary. Duodenal enterokinase converts trypsinogen to activate trypsin which, in tum, activates the other pancereatic enezymes. Atrial natriuretic factor (ANF) is released by walls of the cardiac atrium in response to high sodium concentration, high extracellular fluid volume, or high blood volume. It then acts via various mechanisms to excerete Na, and to cause vasodilation in the circulatory system. It dilates the afferent glomerular arteriole, constricts the efferent golomerular arteriole, and relaxes the mesangial cells. The increases the glomerular filtration rate, resulting in greater excretion of `Na^(+)` and water It also decreases Na resorption in the renal distal convoluted tubule and cortical collecting duct. It also inhibits renin secretion.