icarus wrote:thats my problem... in kaplan they say autoregulation occurs in brain, heart, exercising skeletal muscles ...zip ... they dont say where it is dominant 
in guyton they say that sympathetic outflow has more role on coronary vasculature & muscles & very little on brain itself..so autoregulation plays a keen role in brain!!
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| punu6
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what is it???
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| fireonmyeyes
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cerebral blood flow is autoregulated. i.e., to increase the blood flow the PaCO2 is the most crucial factor...which vasodilates to regulate flow to brain.
it is determined by the level of PaCO2(arteriolar CO2)
during exercise, alveolar ventilation is increased
also, the metabolism is increased
we know that the PACO2 is proportional to metabolism/ alveolar ventilation
thus the PACO2 and the PaCO2 remains relatively normal or constant.
since there is no such change in the PaCO2 levels, the flow remains relatively constant and thus no vaso--related changes or flow changes takes place .
Edited by fireonmyeyes on 06/29/09 - 12:20 AM
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| icarus
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Blood flow through an organ would be increased by decreasing which of the following
A.
The diameter of the arterial vessels
B.
The number of open arterial vessels
C.
The arterial pressure
D.
The diameter of the venous vessels
E.
The hematocrit
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| GoodGirl
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D
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| icarus
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Nope ... U fell in the same trap GoodGirl...I also chose D ... the asnswer is E (((
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| Dr.yesIcan
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awesome questions icarus..i really enjy reading them, i m learning soo much. I will try and answer the next ones that u post...hopefully i will see them before u post the answers...good job buddy  
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| icarus
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You are very welcome, here is this beast :
Patients may experience nausea and a sense of early satiety following which of the following procedures
A.
Surgical resection of the proximal small bowel
B.
A vagotomy of the distal stomach
C.
Surgical resection of the proximal stomach
D.
Surgical removal of the gastric antrum
E.
A vagotomy of the orad stomach
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| Dr.yesIcan
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A ?? could be something to do with CCK which helps with satiety
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| icarus
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No not A ....
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| icarus
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wanna try again, or you want the answer?
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| Dr.yesIcan
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E???
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(not sure of this explanation!!!correct me if wrong)
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