The diagram illustrates pressure changes in the aorta, left atrium and left ventricle throughout the cardiac cycle. Which row describes the changes in the left ventricle at different points on the graph?
- Abetween 1 and 2; contract; remains constant
- Bbetween 2 and 3; relax; increases
- Cbetween 3 and 4; contract; remains constant
- Dbetween 4 and 5; relax; decreases