Cardiac Cycle

Question 1

what is systole

Answer 1

period of ventricular/ atrial contraction

Question 2

what is the cardiac cycle on the left side? 5 steps

Answer 2

1. Blood drains into left atrium from lungs along the pulmonary vein
2. Raising of the blood pressure in the left atrium forces the bicuspid valve open.
3. Contraction of the left atrial muscle (left atrial systole) forces more blood through the valve.
4. As soon as left atrial systole (muscle contraction) is over, the left ventricular muscles start to contract. This is called left ventricular systole.
5. This forces the bicuspid valve to close and opens the valve in the mouth of the aorta (semilunar valve). Blood then leaves the left ventricle along the aorta.

Question 3

what is diastole

Answer 3

period of ventricular/ atrial relaxation

Question 4

what happens during atrial systole

How long does atrial systole last

Answer 4

During atrial systole the left and right atria contract at the same time and push blood into the left and right ventricle

atrial systole lasts 0.1 seconds

Question 5

what happens during ventricular systole

How long does ventricular systole last

Answer 5

During ventricular systole both ventricles contract, blood is forced to the lungs via the pulmonary trunk or to the rest of the body via the aorta depending on which side of the heart.

atrial ventricular lasts 0.3 seconds

Question 6

what happens during cardiac diastole

Answer 6

the heart muscles relaxes and the chambers of the heart fill with blood so blood pressure decreases

Question 7

What is the function of the coronary artery

Answer 7

Function of the coronary arteries is to deliver oxygenated blood to the myocardium

Question 8

What is systole during the cardiac cycle

Answer 8

the contraction phase

Question 9

What is diastole during the cardiac cycle

Answer 9

the relaxation phase