Cardiac cycle

Question 1

What are the stages of the Cardiac cycle?

Answer 1

Atrial systole, Ventricular systole, Ventricular diastole

Question 2

What happens in Atrial systole?

Answer 2

Blood enters into the atria through the inferior/superior vena cava and the pulmonary vein

Question 3

What happens in Ventricular systole?

Answer 3

Atrium contract to push blood into the ventricles, tricuspid and bicuspid valves close to ensure blood only flows into the ventricles

Question 4

What happens in Ventricular diastole?

Answer 4

Ventricles contract to push blood into the pulmonary artery and aorta as the semilunar valves open whilst he tricuspid and bicuspid valves shut

Question 5

What is a cardiac muscles?

Answer 5

A myogenic cell

Question 6

What does myogenic mean?

Answer 6

A cell that can beat to its own beat, independent of the pacemaker

Question 7

What is the SAN?

Answer 7

The right atrium has a lot of myogenic cells which make it the pacemaker of the heart, it sets the rate at which the rest of the heart will beat

Question 8

Why does the left and right sides of the heart beat at a slightly different time?

Answer 8

Because overwise, the blood would be forced out of the heart