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Cards In This Set
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The kidneys receive blood supply via the _____ receiving approximately ___ of the heart's output of blood
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Renal / 1/4
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The basic unit of the kidney, that is composed of a vascular and tubular component
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Nephron
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Extend from the renal artery an enter the kidneys, carrying blood flow to the glomerulus of the nephron
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Afferent arterioles
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A tuft of filtering capable capillaries that represents the first step, filtration, in urinary production
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Glomerulus `
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Filtration involves a protein-free plasma that's filtered across glomerular membranes into ________
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Bowman's capsule
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The _________ surround the tubular parts of the nephron, which must eliminate the glucose, salt, and water from the kidneys and return them into the general circulation
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Peritubular capillaries
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______ is the collecting point for the glomerular filtrate. this represents the first portion of the tubular component
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Bowman's capsule
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Lies next to the glomerulus and bowman's capsule and represents the region where reabsorption occurs of the glomerular and bowman's capsule filtrate
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Proximal convoluted tubule
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Composed of two limbs, a descending limb that lead to the adrenal medulla, and an ascending limb that feeds upwards from the renal medulla and is a major component in developing water-retention mechanism
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Loop of henle
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The three steps involved in urine production
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1. glomerular filtration
2. tubular reabsorption 3. tubular secretion |
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In glomerular filtration, protein free plasma indicates what?
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Blood cells and proteins are excluded from the filtering process because pores in the capillaries are too small to admit by diffusion
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3 pressures that must be accounted for in filtrartion1
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1. blood hydrostatic pressure that drives the filtration system
2. plasma colloid(oncotic) pressure that opposes filtration 3. capsular hydrostatic pressure that also opposes filtration |
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________ pushes filtrarte through the glomerulus and into bowman's capsule
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Blood hydrostatic pressure
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Equation for calculating net pressure
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Filtration pressure= blood hydrostatic presssure-( plasma oncotic pressure + bowmans capsular pressure)
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What are the normal values for pressures?
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1. blood hydrostatic pressure 70 mm Hg
2. plasma oncotic pressure 25 mm Hg 3. bowman's capsular hydrostatic pressure is 15 mm Hg 4. net (filtration) pressure 30 mm Hg |
