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osmoregulation Cheat Sheet by

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)
 
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 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
 

kidneys

nephrons
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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