For each of the questions (a) to (j), choose an answer A, B, C or D and put a cross in the
box . Mark only one answer for each question. If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
The diagram shows a section through the human heart .
The correct direction for the flow of blood in the heart is from chamber
(1)
A to B
B to C
C to D
D to A