A-LevelBiologyTransport in mammalsOct/Nov 2012Paper 1 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.
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The correct answer is B. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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