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A&P2 Test 5 #6 Urinary System-C-V-& JGA

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Question
Answer
PARITUBULAR CAPILLARIES are a:   network of capillaries  
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Peritubular capillaries are formed:   from the division of the efferent arteriole to a cortical nephron  
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Peritubular capillaries usually rejoin   to form the interlobular veins  
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VASA RECTA are specialized branches:   of the peritubular capillaries in the medullary region  
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Vains are divided like arteries but:   more or less in reverse  
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RENAL VEIN joins the:   INFERIOR VENA CAVA in the abdominal cavity  
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MACULA DENSA (MD) is assoc:   w/DCT  
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Macula Densa contains:   CHEMORECEPTORS & OSMORECEPTORS  
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Chemoreceptors & Osmoreceptors:   respond to solute concentrations of filtrate  
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Macula Densa-describe   tall, closely packes tubulel  
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Macula Densa-located:   point where LOH & DCT meet  
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MD cells adjascent to:   JG cells, which are part of wall of afferent arteriole  
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JG aka   JUSTAGLOMERULAR CELLS  
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JG CELLS are large, smooth:   muscle cells w/prom. secretory granules containing renin  
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JG cells are modified smooth M. cells from:   tunica media of the afferent arteriole that meet cells of the DCT  
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JG cells detect:   BP changes in afferent arteriole  
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JGA is the:   JUSTAGLOMERULAR APPARATUS  
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The JG system helps   regulate renal BP  
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When arterial BP falls   JG cells release renin into blood  
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RENIN triggers a series of   enzymatic reactions  
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Enzymatic reactions caused by renin make:   ANGIOTENSIN 1  
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ANGIOTENSIN 1 is converted to:   ANGIOTENSIN II by ACE  
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ACE is   ANGIOTENSIN CONVERTING ENZYMES in the lungs & plasma  
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Angiotensin II is a potent:   vaso contrrictor & also stimulates thirst center in hypothalmus  
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Renin also stimulates the:   adrenal cortex to produce aldosterone  
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ALDOSTERONE enhances renal:   re absorption of NA+ & encourages posterior 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 volume & BP  
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These 3 work to increase BP & Volumn:   aldosterone, angiotensin II, & ADH  
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ANP is   atrial natriuretin peptide  
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ANP provides homeostatic:   regulation of this sys by lowering BP  
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ANP causes dilation of the:   arrerent arteriole & constriction of the efferent arteriole  
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The dilation & constriction of ANP:   increases GFR and ultimately increases uring prod.  
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Loop of Henley-has   ASCENDING & DESCENDING sections  
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