Question

why blood pressure is greater at feet than at brain

Answer 1

It is so because as we go upper from earth's surface the gravitational force decreases and air also becomes thin , so our head is very higher then our feets touches the ground , only this must difference of height also makes huge differences

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Answer 2

there are 2 reasons:
1) distance b/t heart and feet is greater than dis. b/t heart and brain
2) the blood from the feet has to be pushed back against the force of gravitation