AP BIOLOGY

Detailed explanation-1: -The primary osmoreceptors that control AVP secretion and thirst are located in the anterior hypothalamus.

Detailed explanation-2: -They also contain neurons with receptors for angiotensin, atrial natriuretic factor, endothelin and relaxin, each of which important in the regulation of fluid and electrolyte balance.

Detailed explanation-3: -An osmoreceptor is a sensory receptor primarily found in the hypothalamus of most homeothermic organisms that detects changes in osmotic pressure. Osmoreceptors can be found in several structures, including two of the circumventricular organs – the vascular organ of the lamina terminalis, and the subfornical organ.

Detailed explanation-4: -The water concentration of the body is monitored by osmoreceptors in the hypothalamus, which detect the concentration of electrolytes in the extracellular fluid.

Detailed explanation-5: -Extracellular dehydration is also detected by baroreceptors Baroreceptors respond to decreases or increases in blood pressure by inducing or inhibiting thirst, respectively, through their projections via cranial nerves IX and X to a brainstem region called the nucleus of the solitary tract.