Cardiac Cycle

Question 1

1. Late diastole

Answer 1

both sets of chambers relaxed and ventricles filled passively

Question 2

2. Atrial systole = p wave

Answer 2

atrial contraction forces small amount of additional blood into v’s
still part of diastole

Question 3

3. Isovolumic ventricular contraction

Answer 3

first phase of v contraction pushes AV valves closed

volume doesnt change as no blood is moving out of v’s

Question 4

4. Ventricular ejection

Answer 4

ventricular pressure rises and exceeds pressure in arteries, semilunar valves open and blood is ejected
first phase of systole

Question 5

5. Isovolumic ventricular relaxation

Answer 5

As ventricles relax, pressure in v falls, blood flows back into cups of SL valves and snaps them closed
no change in blood volume

Question 6

Cardiac Cycle

Answer 6

“All mechanical and electrical events occurring during a single heart beat” 2:1 ratio
Diastole - ventricles untwist, lengthens and unthickens
- relaxation allows for filling
Systole - ventricles twist, shorten and thickens
- blood rapidly ejected from ventricle, high
pressure