DrVirgo
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| robin082006
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B
where is the letter Z?
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| hlab27
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I think the answer is D. My reasoning is that our normal coronary blood pressure should follow diastolic which is 80. And at that point, it shouldn't be at the maximally dialated since this is at normal conditions. Thus we start at point Y where we aren't at a max blood flow but pressure is that of the diastolic pressure.
Then when we go to run for a bus, our sympathetics kick in and the heart rate/BP/flow goes up along with our diastolic pressures then W would occur.
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| Cedrick
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MY answer was C
but It was guess ?!
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| robin082006
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hlab27
Firstly I guess Z is V because I do not see Z letter in the figure.
in the figure point X has the lowest values for flow and pressure. the solid line just indicates the slope when maximally dilated.
so when excercise---> flow and pressure increase. Then we exclude choice A, choice E
Choice C: significant increase in pressure but small increase in flow--> may be constriction of coronary artery--> we exclude this choice
Choice D: point Y has quite high pressure, the slope from Y to W is parallel to maximally dilated slope--> this case may be seen in hypertension with maximal effort.
So I go with B, it is the best choice I think.
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| DrVirgo
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I guessed D.
Robin, Z is the only letter that is to the left of the horizontal line.
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| nadiabarati
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I think D
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| HPE_DOC
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D
Autoregulation occurs between pressures of 60 and 200 mm Hg so the starting pressure has to be between those two values. The first and last choices cannot be tenable because the blood flow is actually decreasing during the process of running. X cannot be a starting point because its way out of the normal physiological range (<60 mm Hg).
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| rman
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Definitely D; there is a rt shift in the flow-pressure diagram with exercise
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| Cedrick
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Ok
B
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| reet
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I would go with B
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| leen
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confused between B n D...
anyone pl ....
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| Diego Casali
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For the same reason explained by hlab27, I would choice D.
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| eytanraz
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D definitely
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| suv
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D ofcourse!
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| docswapna
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I think C bcos during exercise blood flow increases at the same pressure.
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| klimt
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tricky question!
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| klimt
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I go with D
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| mytimenow
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D DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
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| aim
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B
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| ssrpk
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i go with D
an interesting question!
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| lilla
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the correct answer is C. b/c exercise: more volume pumped at the same pressure. kaplan physiology about coronary circulation has good explanation.
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