Q.No.6.11:- For which position will the maximum blood pressure in the body have the smallest value: (a) Standing up right (b) Sitting (c) Lying horizontally (d) Standing on one’s head?

Q.No.6.11:- For which position will the maximum blood pressure in the body have the smallest value: (a) Standing up right (b) Sitting (c) Lying horizontally (d) Standing on one’s head?

Ans:- When a man lying horizontally then in this case the heart will work quiet small. Consider the lying position, in this case all the parts are in level with the heart. When the blood circulates then every part of blood vessels make an angle of 90 degree with the earth surface. And the cos90 is zero(0) so the work done by heart against gravity  becomes zero( or approximately negligible).