cortex is the part of the brain that triggers the thirst response when blood volume and pressure are low.
cortex is the part of the brain that triggers the thirst response when blood volume and pressure are low.
when blood volume and pressure is low which part of the brain triggers the thirst response?
cortex
there are receptors and other systems in the body that detect a decreased volume or an increased osmolite concentration. they signal to the central nervous system, where central processing succeeds. some sources, therefore, distinguish "extracellular thirst" from "intracellular thirst", where extracellular thirst is thirst generated by decreased volume and intracellular thirst is thirst generated by increased osmolite concentration. nevertheless, the craving itself is something generated from central processing in the brain, no matter how it is detected.









































section::::detection.
thirst
this is one of two types of thirst and is defined as thirst caused by loss of blood volume (hypovolemia) without depleting the intracellular fluid. this can be caused by blood loss, vomiting, and diarrhea. this loss of volume is problematic because if the total blood volume falls too low the heart cannot circulate blood effectively and the eventual result is hypovolemic shock. the vascular system responds by constricting blood vessels thereby creating a smaller volume for the blood to fill. this mechanical solution however has definite limits and usually must be supplemented with increased volume. the loss of blood volume is detected by cells in the kidneys and triggers thirst for both water and salt via the renin-angiotensin system.
thirst