Lecture 4

Question 1

What valves closing create the Systole?

Answer 1

1) Mitral
2) Tricuspid

“Lub”

Question 2

What valves closing create the diastole?

Answer 2

1) Aortic
2) Pulmonary

“Dub”

Question 3

What happens during systole and diastole

Answer 3

Systole
-Heart contracts

Diastole

• Relaxation
• Heart fills w blood

Question 4

What is the total duration of the cardiac cycle

Answer 4

Reciprocal of the HR

Question 5

What does the mitral valve do?

Answer 5

-Allows blood to go from left atrium –> left ventricle

Question 6

What does the aorta do?

Answer 6

-Allows blood to go from left ventricle –> Aorta

Question 7

Cardiac cycle

Answer 7

-AP generated in SA node, sinoatrial –> Atria = atrial contraction then..

1) Diastole
- Atrial systole –> during late ventricular diastole

2) Systole (S1)
- Isovolumetric contraction –> Mitral valve closure begin

3) Systole
-Ventricular ejection –> Aortic valve opening begin
(Rapid ventricular ejection)
(Reduced ventricular ejection)

4) Diastole (S2)
- Isovolumentric relaxation –> Beginning of aortic valve closure

5) Diastole
- Ventricular filling –> Beginning mitral valve opening

Question 8

What are the parameters that describe the cardiac cycle?

Answer 8

1) Electrical activity
2) Pressure changes (Atrial, ventricular, arterial)
3) Blood volume changes (Atrial, ventricular, arterial)
4) Sounds