It will be B.Normal venous pressure in the feet is 3.3 kPa. When a person stands very still venous blood
pressure in the feet rises to 5.0 kPa. What causes the high pressure?
A Muscles in the walls of the veins contract, reducing the diameter of the veins.
B Skeletal muscles in the legs are not squeezing blood upward in the veins.
C Systolic blood pressure increases.
D The semilunar valves in the veins of the leg cease to function.
What is your doubt?