The blood pressure in the fingertips can be different depending on the position

Question

The blood pressure in the fingertips can be different depending on the position of the arm. Consider position A and B, as shown in the figure. Assume the arms are lifted slowly so the blood pressure has time to equilibrate, the blood is static and the blood pressure in the head remains constant. What is the difference in blood pressure in the capillaries of the fingertips for positions A and B? (Hint: to determine the arm length, measure your roommate or your study partner.)

Explanation / Answer

We know that pressure difference in a column = rho*gh

                      here rho = 1025 kg/m^3, h = 2L = 2*0.8 m=1.6m where L is length of arm.

     pressure difference B-A = 1025*9.8*1.6

                   = 16072 Pa

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