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osmoregulation intro bio 2
osmoregulationabout preventing dehydration | - for terrestrial animals |
why does osmoregulation work?endocrine-mediated regulation of excretory system | antidiuretic hormone (ADH) or vasopressin (AVP) | | | triggered by increase in osmolarity | | | makes collecting duct of nephrons more permeable to water | | | increase water retention | variation in urine | -hypotonic | remove water, retain salt | -hypertonic | retain water, remove salt |
| | excretory system and osmoregulationexcretory 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 |
| | kidneysnephrons | function excretory unit in kidney | | | | | interfaces w/ circ system (bowman's capsule) | | | collecting ducts pass filtrate to the ureter | filtrate includes | water, NaCl, ions (H bicarbonate), urea, glucose, amino acids, drugs/poisons | reabsorption | active&passive transport | | | 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: | | | highly reduces in volume (water is retained by the body) | | | highly reduced in important solute [NaCl] | | | highly concentrated in waste solutes (urea) |
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