CARDIOVASCULAR 8

Question 1

What is the cardiac cycle?

Answer 1

Sequence of events that occur when the heart beats

Question 2

Two phases in the cardiac cycle:

1) Ventricles relaxed
2) Ventricles contract

Answer 2

1) Diastole

2) Systole

Question 3

Contraction-relaxation cycle generates
Blood flow from?
which side of on the heart has a higher pressure?

Answer 3

Pressure gradients
High pressure to low pressure
the left side

Question 4

Mechanical events of the cardiac cycle:

1) Late diastole
2) Atrial systole
3) Isovolumic ventricular contraction
4) Ventricular ejection
5) Isovolumic ventricular relaxation

Answer 4

1) Both sets of chamber are relaxed and ventricles filled passively
2) Atrial contraction forces a small amount of additional blood into ventricles
3) First phase of ventricular contraction pushes AV valves closed but does not create enough pressure to open semilunar valves
4) At ventricular pressure rises and exceeds pressure in the arteries, the semilunar valves open and blood is ejected
5) As ventricles relax, pressure in ventricles falls, blood flows back into cusps of semilunar valves and snaps them closed

Question 5

What lies between S1 and S2?

Answer 5

Ventricular systole

Question 6

Heart sounds

1) 1st Heart sound:
2) 2nd Heart sound:

Answer 6

1) Vibrations following closure of the AV valve –“Lub”

2) Vibrations created by closing of semilunar valves

Question 7

What is Auscultation?

Answer 7

Listening to the heart through the chest wall through a stethoscope