CAIE A Level Biology 9700 · Transport in mammals
The aorta is an elastic artery carrying blood away from the left ventricle, while the brachial artery in the arm is a muscular artery carrying blood to the upper limb. Compare the structure of the aorta and the brachial artery, and explain how their structural differences relate to their respective functions in the circulatory system. In your answer, include the role of elastic recoil.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.