A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2012 · Q311 Mark
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?
AMuscles in the walls of the veins contract, reducing the diameter of the veins.
BSkeletal muscles in the legs are not squeezing blood upward in the veins.
CSystolic blood pressure increases.
DThe valves in the veins of the legs allow blood to flow to the feet.
✓ Correct answer
B: Skeletal muscles in the legs are not squeezing blood upward in the veins.
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