PSY398H5 Chapter Notes - Chapter 5: Portal Vein, Vagus Nerve, Blood Sugar
Document Summary
Breatharians- believe you can absorb all the nutrients from the air so you don"t need food and water. Extracellular thirst water that is lost extracellular like blood loss or sweating. Too much water can lead to brain swelling- nausea and dizziness and may be fatal. Esp if there is no electrolytes in the water. Drop in blood pressure baroreceptors (mechanoreceptors) in the kidney: the angiotensin converts angiotensin 1 to 2, renin released upon activation of baroreceptors, ang1 doesn"t even have a lot of functions, ang2 leads to vasoconstriction (very potent) A side effect is production of aldosterone and adh. Those 2 increase sodium and water reabsorption, respectively. Extracellular thirst- sensed via vasopressin and intra is thru the actual salt concentration so same area of brain but diff mechanisms. Cultural drinking- parandial drinking: so having water with food, whenever you eat then due to childhood conditions it is anticipated that we need water after eating food- conditioned response.
