b. When a part of the heart contracts, the blood pressure in that part increases. When the part relaxes, the blood pressure in that part decreases.
The table shows the changes in blood pressure in the left atrium, the left ventricle and the
aorta at different times during a sequence of contraction and relaxation of the heart.
i. At which time is the left atrium most relaxed?
ii. Between which times are the atrioventricular valves closed?
iii. At which time does blood start flowing into the aorta? explain you answer
