CAPE Biology Unit 2 · 2015 · Paper 1 · Question Q20

Which of the following is true for the structure labelled X?

1. (A)Receives impulses from the brain to initiate contraction of the atria
2. (B)Delays impulses for a fraction of a second before they travel down into the ventricles
3. (C)Separates the right ventricle from the left ventricle
4. (D)Conducts impulses very rapidly to the base of the ventricles

This question uses a figure or table from the paper — you'll see it when you practise.