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OSMOREGULATION (maintaining stable balance of water in blood), Harriet…
OSMOREGULATION (maintaining stable balance of water in blood)
Increased water content - HIGH LEVELS - internal stimulus (too much water in blood)
Receptors in hypothalamus detects too much water in the blood (blood volume too high and too dilute) --> send message to the pituitary gland
ADH
secretion from the pituitary gland
stops/slows
Less ADH in the blood stream, making kidneys less permeable to water (less water is
reabsorbed
from kidney tubules back into blood stream)
larger volume of dilute urine (lighter in colour/ colourless) excreted to remove excess water from blood
blood volume decreases until normal levels return
ADH
: Antidiuretic hormone, helps maintain water balance by regulating the water absorption of the kidneys
Osmoreceptors in the hypothalamus (monitor blood osmolarity(water content) and send the messages to the pituitary gland
hyponatremia: water intoxication, excessive water intake
causes: nausea, confusion, diminished reflexes
external stimuli: drinking too much water
Decreased water content - LOW LEVELS - internal stimulus (too little water in blood)
receptors in the hypothalamus detect not enough water in the blood (blood volume too low and too concentrated)
message is sent to the pituitary gland and ADH is secreted
ADH secretion:
Increased
(amount released depends on concentration of blood (more concentrated = more ADH released)
More ADH in the blood stream, makes kidneys more permeable, more water is reabsorbed in the kidneys from urine
urine volume decreases and urine increases in concentration (darker in colour)
blood volume increases until levels return to normal
ADH
: travels through the circulatory system (blood) to the kidneys
external stimuli: excess salt consumption, sweating, vomiting
Water content influence: Cellular respiration
Glucose + Oxygen --> Carbon Dioxide +
Water
+ ATP + (heat)
Harriet Bodle