Question

Take the density of blood to be ρ and the distance between the feet and the heart to be h_H. Ignore the flow of blood.

(a) Show that the difference in blood pressure between the feet and the heart is given by

P_F − P_H = ρgh_H.

(b) Take the density of blood to be 1.05 ✕ 10³ kg/m³ and the distance between the heart and the feet to be 1.39 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 flows away from the heart. Also, pumping action produced by physical activities such as walking and breathing assists the heart.

Answer 1

P- Pot pgb The reference level at the level of the tot so PoopH, the pressure at the fact a depth hu below the reference level in the pool of Poland in the body PF - PH + Pght PF - PH - Pg hn PE - Pu - (1.05x103) (9.80)(1-39) - 14.3031 x103 pa – 14.3031 x 103 pa PE-PH. 14.3031 x103 pa,