B7.4-5 The Heart & Cardiac Cycle

Question 1

Where is the atrioventricular valve located

Answer 1

In-between the atrium and ventricle

Question 2

Where is the semi lunar valve located

Answer 2

Between the ventricle and blood vessels

Question 3

Role of the coronary artery

Answer 3

Supply the heart with blood

Question 4

What happens if the coronary artery is blocked

Answer 4

Cells die, leading to a heart attack

Question 5

What is cardiac output

Answer 5

Volume of blood pumped by a ventricle in 1 minute

Question 6

Cardiac output formula

Answer 6

Stroke volume x heart rate

Question 7

3 steps in the cardiac cycle

Answer 7

Diastole
Atrial systole
Ventricular systole

Question 8

What happens in diastole

Answer 8

Atrium and ventricle relax
Blood enters atrium
When atrial blood pressure > ventricular blood pressure, atrioventricular valve opens

Question 9

What happens in atrial systole

Answer 9

Atrium contracts, increasing pressure further
Remaining blood enters ventricles

Question 10

What happens in ventricular systole

Answer 10

Ventricles contract
Atrioventricular valves close (BP in Ventricles higher than atrium) (to prevent backflow)

Semilunar valves open, blood moves into vessels
When BP in vessels is greater than ventricles, semi lunar valve closes