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BSF:

Body Structure and Function - Urinary Tract - 11/11/24

QuestionAnswer
name the organs in the urinary system two kidneys, two ureters, bladder, urethra
describe the difference between left and right kidney right is lower and smaller than left
where are the kidneys found? between T12 and L3 vertebrae (retroperitoneal position) against posterior wall of abdomen, under diaphragm and behind peritoneum
where is the ureters end in females AND males? posterior wall of urinary bladder
shape of ureteral openings? slit like
slit like shape of ureteral openings does what? stops backflow to kidneys during bladder contraction
first step of the micturition reflex? stretch receptors in the detrusor muscle are stimulated as bladder fills
stretch receptors in the detrusor muscle are stimulated as bladder fills? first step of the micturition reflex
second step of micturition reflex? interneurons relay signal to thalamus and cerebral cortex
when interneurons relay signals to thalamus and cerebral cortex what happens? urge to urinate when bladder contains 200ml urine approximately
third step of micturition reflex? motor neurons in detrusor muscle cause sustained contraction of bladder - parasympathetic stimulation
interneurons relay signal to thalamus and cerebral cortex? second step of micturition reflex
motor neurons in detrusor muscle cause sustained contraction of bladder - parasympathetic stimulation? third step of micturition reflex
describe what happens when motor neurons in detrusor muscle cause sustained contraction of bladder - parasympathetic stimulation hydrostatic pressure builds in bladder urination occurs only if both internal and external urethral sphincters are relaxed
step 4 of micturition reflex? relaxation of external sphincter under voluntary control
describe the relaxation of external sphincter under voluntary control stimulates relaxation of internal sphincter if external sphincter contracted bladder with relax up to an hour
step 5 of micturition reflex? beyond 500ml urine in bladder pressure is so high that the internal sphincter is forced open reflex causes the external sphincter to open and urination ensues
in a cross section of a kidney what is visible? cortex, medulla, calices and pelvis
Created by: cowcow
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