sharsky
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during normal micturition, pressure within the bladder increases in response to which of the following changes?
a. Contraction of the external sphincter
b. parasympathetic outflow from the sacral spinal cord
c. somactic efferent outflow from the sacral spinal cord
d. sympathetic outflow from the lumbar spinal
e. voluntary relaxation of the external sphincter
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| robin082006
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B?
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| nadiabarati
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B
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| asherif
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Answer is:
b. parasympathetic outflow from the sacral spinal cord
contraction of the bladder wall(this will increase the pressure inside to force the urine outside) & relaxation of the bladder sphincter
a. Contraction of the external sphincter
won't change the pressure inside the bladder, but should significantly increase preasure if it is contracted against a contracting bladder wall during micturation (but this is not normal to do during micturation and would be very painful  )
c. somactic efferent outflow from the sacral spinal cord
Somatic efferent outflow is to the lower limb?
don't think that will affect pressure inside the bladder
d. sympathetic outflow from the lumbar spinal
This should rather relax the wall of the bladder decreasing pressure and contract the spincter(doesn't happen during micturation)
e. voluntary relaxation of the external sphincter
Should rather cause some decrease in pressure as you give the water an outlet from the increasing pressure.
ps feel free to correct me 
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