Zoology - Chemical Coordination and Integration Question with Solution | TestHub
Which one of the following four secretions is correctly matched with its source, target and nature of action?
Options:
Answer:
Solution:
Gastrin is a polypeptide hormone produced by the enteroendocrine cells of the stomach. It plays an important role in the control of gastric acid secretion. Inhibin hormone is secreted from corpus luteum, placenta and testes. It supplements the effect of excess sex hormones for depressing gonadotrophic activity target of inhibin is anterior lobe of pituitary. Duodenal enterokinase converts trypsinogen to activate trypsin which, in turn, activates the other pancreatic enzymes. 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 excrete , and to cause vasodilation in the circulatory system. It dilates the afferent glom erular arteriole, constricts the efferent glomerular arteriole, and relaxes the mesangial cells. This increases the glomerular filtration rate, resulting in greater excretion of and water. It also decreases Na resorption in the renal distal convoluted tubule and cortical collecting duct. It also inhibits renin secretion.
