2.3

Question 1

duration of cadiac cycle

Answer 1

0.8 sec

Question 2

systole duration

Answer 2

0.27 sec

Question 3

diastole duration

Answer 3

0.53 sec

Question 4

duration of ventricular ejecction

Answer 4

0.25 sec

rapid ejection phase + slow ejection phase

Question 5

duration of ventricular filling

Answer 5

0.38 sec

rapid filling + diastasis + last rapid filling

Question 6

define Systole and Diastole

Answer 6

Systole- period of heart contraction

Diastole- period of heart relaxation

Question 7

what controlls the opening and closing of valves?

Answer 7

direction of flow

Question 8

describe main events in the P wave period of the cardiac cycle

Answer 8

1. atrial depol -> atrial contraction -> atrial P ↑
2. AV valves are open
3. left ventricular P is lower in order for the blood to flow from atria to venticle
4. aortic valve must be close to allow ventricular filling

Question 9

describe main events in the QRS complex period of the cardiac cycle

Answer 9

1. aortic valve is closed

2. mitral valve is closed

Question 10

describe what is Isovolumetric contraction?

Answer 10

we are talking about the left ventricle when both aortic valve and mitral valve are closed and the volume inside the ventricle is not changing but the ventricular pressure ↑ bcs. there is contraction of the ventricular muscle

Question 11

when can we hear S1 sound?

Answer 11

durring isovolumetric contraction
closure of the AV valves
due to Turbulant flow

Question 12

describe main events in the ejection period of the cardiac cycle

Answer 12

1. left entricular P becomes higher than the aortic P -> aortic valve opens -> blood flows to aorta
2. pressure in aorta and LV continue to ↑ until 120 mmHg
3. left atria is being filled again
4. at the end of ejection aortic valve closes

Question 13

heart sounds are result of

Answer 13

closure of the valves

Question 14

when can we hear S2 sound?

Answer 14

results from the closure of aoretic valve at the beginning of isovolumetric relaxation