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about preventing dehydration
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- for terrestrial animals
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endocrine-mediated regulation of excretory system
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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
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variation in urine
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-hypotonic
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remove water, retain salt
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-hypertonic
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retain water, remove salt
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excretory system: regulate solute movement between internal fluids and environment
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filtration
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filtering body fluids
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reabsorption
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reclaiming water & valuable solutes
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secretion
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adding nonessential solutes and wastes from the body fluids to filtrate
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excretion
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processed filtrate containing nitrogenous wastes released from the body
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nephrons
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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
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filtrate includes
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water, NaCl, ions (H bicarbonate), urea, glucose, amino acids, drugs/poisons
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reabsorption
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active&passive transport
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water, NaCl, bicarbonate, glucose, amino acids
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- of water and NaCl occurs along loop of henle
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-solute [ ] (osmolarity) of interstitial fluid increases towards the center of kidney
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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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