Osmoregulation

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Description and Tags

Vert Phys Exam 2

9 Terms

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osmoregulatory organ

kidney

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kidneys

Fed by renal arteries

Send blood back to the heart

Receive ¼ of cardiac output

Filter ~180 liters/day

Create ~1 liter of urine

Lots of reabsorption!

Fxn unit: nephron (1 mil per kidney)

<p>Fed by renal arteries</p><p>Send blood back to the heart</p><p>Receive ¼ of cardiac output</p><p>Filter ~180 liters/day</p><p>Create ~1 liter of urine</p><p>Lots of reabsorption!</p><p>Fxn unit: nephron (1 mil per kidney)</p>
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<p>where is the glomerulus in a nephron</p>

where is the glomerulus in a nephron

top left corner

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proximal tubule

~75% of filtrate absorbed (a LOT of active transport), cells have a lot of mitochondria

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distal convoluted tubule (DCT)

site of highly regulated excretion and reabsorption

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loop of henle

creates an osmotic concentration gradient in the renal medulla

<p>creates an osmotic concentration gradient in the renal medulla</p>
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Corticomedullary osmolarity gradient

top = 300 mOsm (similar to blood), bottom = 120 (similar to seawater); as we go down, more water wants to leave

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