A-LevelBiologyTransport in mammalsOct/Nov 2022Paper 1 Q351 Mark
Which statement about the structure of the heart is correct?
AThe semilunar valves close when the pressure in the ventricles falls lower than the pressure in the arteries.
Bmuscle called the septum separates the atria from the ventricles.
CThere is a small patch of tissue in the right atrium that acts to delay the electrical impulse.
DClosure of valves in the veins prevents backflow of blood into the ventricles.
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The correct answer is A. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
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