Fluid and Electrolye Balance
Kidney blood volume or
pressure
Primary organ involved in
When person sweats
osmoregulation
excessively, or is
Fluid balance
dehydrated
Alcohol inhibits production of
ADH
Mechanism of action of ADH
Primary function
Decrease loss of water
from kidneys
Reduces concentration
of electrolytes
Increases blood
pressure
Released from pituitary
Changes in Blood Volume
gland to targets:
and Pressure Trigger RAAS
Collection tubules in
Granular cells of juxtaglomerular kidneys
apparatus releases renin in Membrane
response to: more
permeable to
Sympathetic nervous system
water
simulation
(increases
Decreased filtrate osmolarity
water
Decreased stretch
reabsorption)
Due to decreased
Decreased urine
blood pressure
output
Sweat glands
RAAS Decrease
perspiration to
Renin Angiotensin Aldosterone conserve water
System Arterioles
Smooth muscle
Antidiuretic Hormone constricts
Increases blood
Synthesized in pressure
hypothalamus, stored in and
released from posterior Aldosterone
pituitary when hypothalamic
Synthesized in adrenal
osmoreceptors stimulated
cortex
Released in response to:
Zone glomerulosa
Rise in blood
Controls levels of Na+, K+
concentration of
ions in extracellular fluids
electrolytes, fall in
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