PLTW HBS Nephron

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11 Terms

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renal artery

brings oxygenated blood to kidneys

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renal vein

brings deoxygenated blood away from kidneys

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what are the steps of urine formation?

  1. filtration

  2. reabsorption

  3. secretion

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what ions are reabsorbed?

Na+ Cl- K+ Ca2+ Mg2+ glucose

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what ions are secreted?

H+ NH4+ K+

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direction of secretion

into FILTRATE

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direction of reabsorption

into BLOOD

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how many liters of urine do you produce per day?

180L, but not that much is excreted

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filtration

blood pressure forces water, ions, small molecules, and waste (ex. urea) out of the blood into bowman’s capsule, large molecules stay in the bloodstream

where: glomerulus

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reabsorption

valuable solutes (glucose, amino acids, sodium, potassium, bicarbonate) are reabsorbed back into the bloodstream

where: PCT, DCT, LOH, collecting ducts

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secretion

active transport of additional waste products (H+, K+, certain drugs/toxins) from bloodstream into nephron for excretion

where: PCT, DCT, collecting ducts