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snakehips x welcome, x M Last remin x welcome, x twat switch Be x M Assig x M McGraw x GroupMe x d Doodle so x C O ezto.mheducation.com/hm.tpx?todo postSubmissionView egil 12 Award: o out of 1.57 points If cardiac output remains the same and some of the arterioles constrict while the rest remain unchanged, which of the following would occur? O The pressure in the arteries would increase. O Artery pressure and flow through both the dilated and unchanged arterioles will always be the same if the cardiac output doesn't change. The pressure in the arteries would decrease. O The flow through the dilated arteries would decrease. O The flow through the unchanged arterioles would decrease. References Multiple Choice Section: 12.09 13 Award: 1.57 out of 1.57 points 9:11Explanation / Answer
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Answer 1: Choice 2 (when certain arteries or arterioles show differential contraction with respect to the major arteries, a change in blood pressure in the major arteries might change. However, this does not happen and cardiovascular homeostasis is maintained. This maintenance is brought about by differential vasoconstriction and vasodilation in the arteries of that tissue provided the cardiac output is maintained. A common example is seen in the case of pulmonary differential vasoconstrction under edema formation where cardiovascular parameters remain constant but organ specific blood dynamic change)
Answer 2: Choice 1 (the semilunar valves represent the dicuspid or tricispid valves located at the arterio-ventricular junction and ensure uni-directional blood flow from auricles to ventricles. These valves close during ventricular contraction or emptying phase. Simultaneously, the isovolumetric relaxation phase of cardiovascular system represents the short durationat which the volumes of auricular filling and ventricular emptying are same. Thus when these events occur, the semilunar valves are always closed and arterial valves are always open.)
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