Biology 5090 · O Level · Blood vessels

Blood vessels — practice question

Fig. 3.1 presents diagrams showing the flow of blood into and out of three major organs through blood vessels P to U.

(a)[3]

Identify the following blood vessels: Q, R and U.

(b)[3]

Compare the structures of blood vessels Q and R.

(c(i))[3]

Explain why blood in vessel S has a lower concentration of urea than blood in vessel R.

(c(ii))[3]

Explain why blood in vessel U sometimes has a higher concentration of glucose than blood in vessel T.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Pulmonary vein” …