4 Answer all the questions. SECTION A – Module B3 1
(a) This question is about blood and circulation. Look at the diagram of a heart.
B
A
(i)
Write down the names of A and B. A ............................................. B ............................................. [2]
(ii)
The heart pumps blood out of the left and right ventricles. Explain why the left ventricle has a thicker muscle wall than the right ventricle. ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2]
© OCR 2014