Diastole and systole are two phases of the cardiac cycle. They occur as the heartbeats, pumping blood through a system of blood vessels that carry blood to every part of the body. Systole occurs when the heart contracts to pump blood out, and diastole occurs when the heart relaxes after contraction.

1. BASICS OF BIOMEDICAL
SYSTOLE AND DIASTOLE
Prepared by Atheena Pandian

2. PRESENTATION FLOW
KEY CONCEPTS COVERED
Systole
Diastole
Cardiac Cycle
Wiggers diagram
1.
2.
3.
4.

3. The systole is the part of the
cardiac cycle during which
some chambers of the heart
muscle contract after refilling
with blood.
WHAT IS SYSTOLE?

4. Diastole is when the heart
muscle relaxes. When the
heart relaxes, the chambers of
the heart fill with blood, and a
person's blood pressure
decreases.
WHAT IS DIASTOLE?

6. CARDIAC CYCLE
The cardiac cycle is the
performance of the human
heart from the ending of
one heartbeat to the
beginning of the next.

7. CARDIAC CYCLE
It consists of two periods:
one during which the heart
muscle relaxes and refills
with blood, called diastole,
followed by a period of
robust contraction and
pumping of blood, dubbed
systole.

8. CARDIAC CYCLE

9. WIGGERS DIAGRAM
The cardiac cycle involves four
major stages of activity:
1) "Isovolumic relaxation"
2) Inflow
3) "Isovolumic contraction"
4) "Ejection".

10. WIGGERS
DIAGRAM

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