Transcript Cardiac Cycle - Kinver High School

Learning Objectives...
To understand the stages of the
cardiac cycle.
To be able to label the different parts
of the heart.
Heart pictures and information
The Heart
The heart is a double pump – two
separate pumps that work side by side
The right side pumps deoxygenated blood
to the lungs
The left side pumps oxygenated blood to
the rest of the body
The heart consists of four chambers –two
upper atria and two lower ventricles
The atrio- ventricular valves separate the
atria and ventricles
The semi-lunar valves are found in the
pulmonary artery and aorta.
The cardiac cycle
How blood flows through the heart
Two phases
systole – contraction
phase (atrial and
ventricular) – 0.3 secs
diastole – relaxation
phase – 0.5 secs
DIASTOLE
atria fill with blood
pressure rises
atrioventricular valves
open
blood passes by gravity
into ventricles
semi lunar valves closed
SYSTOLE
Atrial systole
Atria contract
Forces remaining blood
into ventricles
Ventricles remain relaxed
Ventricular systole
Ventricles contract at same
time
Blood pressure increases
AV valves forced shut (so
no backflow)
Semi-lunar valves forced
open
Blood pushed into aorta
and pulmonary artery
Part I Cardiovascular system
Briefly describe, in order, the events during the cardiac cycle in the diagrams below.
1. Diastole………………………………………
2. Atrial Systole…………………….………
3. Ventricular Systole……………………
………………………………………………………..
………………………………………………………..
………………………………………………………..
…………………………………………………………
…………………………………………………………
…………………………………………………………
………………………………………………………..
………………………………………………………..
………………………………………………………..
………………………………………………………..
………………………………………………………..
………………………………………………………..
…………………………………………………………
…………………………………………………………
…………………………………………………………
………………………………………………………..
………………………………………………………..
………………………………………………………..