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osmoregulation intro bio 2
osmoregulation
about preventing dehydration |
- for terrestrial animals |
why does osmoregulation work?
endocrine-mediated regulation of excretory system |
antidiuretic hormone (ADH) or vasopressin (AVP) |
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triggered by increase in osmolarity |
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makes collecting duct of nephrons more permeable to water |
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increase water retention |
variation in urine |
-hypotonic |
remove water, retain salt |
-hypertonic |
retain water, remove salt |
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excretory system and osmoregulation
excretory system: regulate solute movement between internal fluids and environment |
filtration |
filtering body fluids |
reabsorption |
reclaiming water & valuable solutes |
secretion |
adding nonessential solutes and wastes from the body fluids to filtrate |
excretion |
processed filtrate containing nitrogenous wastes released from the body |
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kidneys
nephrons |
function excretory unit in kidney |
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interfaces w/ circ system (bowman's capsule) |
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collecting ducts pass filtrate to the ureter |
filtrate includes |
water, NaCl, ions (H bicarbonate), urea, glucose, amino acids, drugs/poisons |
reabsorption |
active&passive transport |
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water, NaCl, bicarbonate, glucose, amino acids |
- of water and NaCl occurs along loop of henle |
-solute [ ] (osmolarity) of interstitial fluid increases towards the center of kidney |
overall filtrate is: |
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highly reduces in volume (water is retained by the body) |
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highly reduced in important solute [NaCl] |
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highly concentrated in waste solutes (urea) |
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