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Stack #39717
A&P2 Test 5 #6 Urinary System-C-V-& JGA
| Question | Answer |
|---|---|
| PARITUBULAR CAPILLARIES are a: | network of capillaries |
| Peritubular capillaries are formed: | from the division of the efferent arteriole to a cortical nephron |
| Peritubular capillaries usually rejoin | to form the interlobular veins |
| VASA RECTA are specialized branches: | of the peritubular capillaries in the medullary region |
| Vains are divided like arteries but: | more or less in reverse |
| RENAL VEIN joins the: | INFERIOR VENA CAVA in the abdominal cavity |
| MACULA DENSA (MD) is assoc: | w/DCT |
| Macula Densa contains: | CHEMORECEPTORS & OSMORECEPTORS |
| Chemoreceptors & Osmoreceptors: | respond to solute concentrations of filtrate |
| Macula Densa-describe | tall, closely packes tubulel |
| Macula Densa-located: | point where LOH & DCT meet |
| MD cells adjascent to: | JG cells, which are part of wall of afferent arteriole |
| JG aka | JUSTAGLOMERULAR CELLS |
| JG CELLS are large, smooth: | muscle cells w/prom. secretory granules containing renin |
| JG cells are modified smooth M. cells from: | tunica media of the afferent arteriole that meet cells of the DCT |
| JG cells detect: | BP changes in afferent arteriole |
| JGA is the: | JUSTAGLOMERULAR APPARATUS |
| The JG system helps | regulate renal BP |
| When arterial BP falls | JG cells release renin into blood |
| RENIN triggers a series of | enzymatic reactions |
| Enzymatic reactions caused by renin make: | ANGIOTENSIN 1 |
| ANGIOTENSIN 1 is converted to: | ANGIOTENSIN II by ACE |
| ACE is | ANGIOTENSIN CONVERTING ENZYMES in the lungs & plasma |
| Angiotensin II is a potent: | vaso contrrictor & also stimulates thirst center in hypothalmus |
| Renin also stimulates the: | adrenal cortex to produce aldosterone |
| ALDOSTERONE enhances renal: | re absorption of NA+ & encourages posterior pituitary to release ADH |
| ADH increases | water retention |
| Increasing water retention means: | that ADH helps increase blood volume & BP |
| These 3 work to increase BP & Volumn: | aldosterone, angiotensin II, & ADH |
| ANP is | atrial natriuretin peptide |
| ANP provides homeostatic: | regulation of this sys by lowering BP |
| ANP causes dilation of the: | arrerent arteriole & constriction of the efferent arteriole |
| The dilation & constriction of ANP: | increases GFR and ultimately increases uring prod. |
| Loop of Henley-has | ASCENDING & DESCENDING sections |
Created by:
Jean and Study Pals