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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Take the density of blood to be ρ and the distance between the feet and the heart to be hH. Ignore the flow of blood, (a) Show that the different in blood pressure between the feet and the heart is given by PFPH = ρghH. (b) Take the density of blood to be 1.05 × 103 kg/m3 and the distance between the heart and the feet to be 1.20 m. Find the difference in blood pressure between these two points. This problem indicates that pumping blood from the extremities is very difficult for the heart. The veins in the legs have valves in them that open when blood is pumped toward the heart and close when blood flow’s away from the heart. Also, pumping action produced by physical activities such as walking and breathing assists the heart.

(a)

To determine
The difference in blood pressure between the feet and the heart.

Explanation

In general the pressure at a depth of fluid is from its reference level is defined as P=P0+ρgh .

Consider the level of the heart as reference level to find the blood pressure at the feet that is P=P0+ρghPF=PH+ρg<

(b)

To determine
The difference in blood pressure between feet and heart.

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