A 24 year old woman present to the emergency department with severe diarrhea. When she is supine (lying down), her blood pressure is 90/60 mm Hg (decreased) and her heart rate was 100 beats/min (increased). When she is moved to a standing position, her heart rate further increases to 120 beats/min. which of the following accounts for the further increase in heart rate upon standing?
A.Decreased total peripheral resistance
B.Increased vasoconstriction
C.Increased contractility
D.Increased afterload
E.Decreased venous return
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Answer:
I think answer is Option B
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