Biology 5090 · O Level · Blood vessels

Blood vessels — practice question

(a)[7]

Describe the route taken by a carbon dioxide molecule after it is formed by respiration in a body cell, up to the point where it enters the air inside the lungs.

(b)[3]

Explain how blood is maintained in flow from the foot to the heart.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “diffusion of CO2” …

Full mark scheme, point by point
Step-by-step worked solution
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