A&P2 Test 5 #8 Urinary-Auto Reg. & Extrinsic Controls
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| RENAL AUTOREGULATION is accomplished by the: | JGA & neg.feedback mechanisms, which are triggered when the filteration rate is decreasine
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| Renal Autoregulation kicks in: | when glomerular pressure falls.
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| When Renal autoregulation kicks in: | the afferent arteriole & glomerular capillaries dilate & the efferent arteriole constricts
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| The MD signals the smooth: | muscles in the afferent arteriole wall to relax
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| The vessels will then dilate causing: | more blood to flow into the glomerulus
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| The pressure then increases, | thereby increasing the rate of filtration
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| The JGA releases: | renin
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| renin causes | angiotensin to form angiotensin 1
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| angiotensin 1 is rapidly changed: | into angiotensin II by ACE
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| ACE is in the: | plasma and lungs
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| Angiotensin II is a powerful | vaso constrictor & stimulates the smooth muscle of efferent arteriole walls to contractto
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| The efferent arteriole walls contracting cause: | blood to back up into the glomerulus & increase glomerular pressureu
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| Hence the glomerular: | filteration rate is increased
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| Renin also stimulates the adrenal cortex to prod: | aldosterone
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| aldosterone enhances renal | reabsorption of Na+ & encourages the postier pituitary to release ADH
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| ADH increases | water retention
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| Increasing water retention means that: | ADH helps increase blood volumn & BP
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| Aldosterone, angiotensin II & ADH all: | work to increase BP & volumn
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| ANP provides homeostatic | regulation of this sys by lowering BP
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| ANP causes dilation of the: | afferent arteriole & constriction of the efferent arteriole
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| thereby increasing the GFR &: | increasing urine production
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| Extrinsic Controls are from | the sympathetic NS as well as baroreceptors
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| BARORECEPTORS are located in: | BV walls of systemic circluation
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| Sympathetic activation results in: | vaso-constriction of the afferent arterioles
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| Micturation occurs when apx: | 200 ml of urine accumulates in bladder
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| MICTURITION FEFLEX CENTERS: | are located in thesacral region of spinal cord
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| Urine is 95% | water
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| When micturition reflex centers recieve impulses; | parasympathetic fibers cause the detrusor muscles to contract & the sphincters to relax
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| As urine works its way into: | urethra, afferent impulses are sent to brain stem & cerebral cortex:need to void urine!
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Created by:
Jean and Study Pals