Describe the Cardiac cycle (atrial systole, ventricular systole and diastole). (Activity 1.7)

Cardiac Cycle:

Diastole:

• Atrial and ventricular diastole Blood flows into the atria.
• Elastic recoil of the atrial walls generates low pressure in the atria, helping to draw blood into the heart. Initially the atrioventricular valves are open/closed.
• As the ventricles begin to relax, blood tends to fall back from the aorta and pulmonary artery causing the semi-lunar valves to close.
• This causes the second…