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19 terms

PSY 123 Chapter 13

STUDY
PLAY
isotonic
equal concentrations outside and inside the cell
hypertonic
larger concentration of substance outside the cell, causes water to move out.
hypotonic
smaller concentration of substance outside the cell, causes water to move in.
volumetric thirst
occurs as a result of hypovolemia. loss of volume in the extracellular fluid compartment
osmometric thirst
the motivational state that arises when cells become dehydrate in an attempt to dilute a highly concentrated extracellular fluid compartment
renin
an enzyme triggered by baroreceptors near the kidney which turns into angiotensin II
aldosterone
helps reabsorb sodium
ADH
anti-diuretic hormone. released by posterior pituitary, encourages kidney to reabsorb water.
subfornical organ
on the blood side of the BBB. communicates with median preoptic nucleus (MnPO) to promote drinking
median preoptic nucleus (MnPO)
promotes drinking
circumventricular
around the ventricles
baroreceptor
receptor that detects drop in blood pressure
osmoreceptor
detects changes in osmotic pressure. stimulate drinking behavior
glycogen
form of stored glucose
glucagon
a hormone released from the pancreas that converts glycogen back into glucose
insulin
pancreatic hormone that helps store glucose in the liver
leptin
hormone that provides a chronic signal about the fat levels and stimulates arcuate POMC/CART and NPY/AgRP neurons to trigger changes in food intake
lipostatic hypothesis
as leptin increases, food intake decreases. tryglicerides, and the role of leptin from fat
arcuate nucleus
monitors energy balance. contains 2 opposing systems for controlling food intake, each which responds to peptide signals.