1. L. Lindahl Mahtomedi Public Schools ISD 832
2/27/2018
Cardiac Cycle
L. Lindahl
Mahtomedi Public Schools ISD 832

2. Introduction We will review the Cardiac Cycle
Identify where a drop of blood flows beginning with the Vena Cava

3. You are a blood drop starting in the Vena Cava
There are two of them: Superior (the upper one) and _________ (the lower one)
Very large and roomy blood vessel
Where will you go next?
Inferior

4. Right! The Right Atrium TOP
You just entered one of the __________ chambers of the heart.
You are separated from the rest of the heart chambers by valves and the____________.
The septum is the muscle that runs up and down in the center of the heart.
septum

5. Next: The Right Ventricle
This is the largest ventricle
As you enter it you pass through the valve.
This valve has
If you squeeze the heart, this ventricle will feel squishier
Where will you go next?
tricuspid
three flaps

6. Now, the Pulmonary Artery
As you enter the P.A. you go through the valve.
The pulmonary artery is filled with BLUE blood.
This blood is low in oxygen and high in ___________________________.
Now you will go to the all important organ: _____________. (both the left and right lung)
pulmonary
carbon dioxide
lungs

7. LUNGS You enter the lungs and here you get rid of your
and replenished with
This happens because of a process called
Capillaries surround the air sacs in the lungs and are very thin. They connect the arteries to the veins.
carbon dioxide
oxygen
diffusion

8. PULMONARY VEINS
You come back to the heart through the pulmonary veins (from the left and right lung).
This is high in oxygen, the only RED vein you will be in.
From here you will enter the _________________________
left atrium

9. Left Atrium From here you go through a valve called the
Then you will be pumped into the ___________ _________.
mitral valve
left ventricle

10. LEFT VENTRICLE This is the smaller ventricle with the most .
Why so much muscle? It has to pump blood to the whole body.
The right ventricle sends blood only to the lungs – not that far.
muscle

11. Go through the aortic valve which leads to the…
which pumps blood out to the rest of the body!
See how it comes behind the heart to go downward. This is so it can bring blood to your lower body (like your pinky toe).
aorta

12. THE WHOLE CYCLE: VENA CAVA (Superior or Inferior) RIGHT ATRIUM
TRICUSPID VALVE
RIGHT VENTRICLE
PULMONARY VALVE
PULMONARY ARTERY
LUNGS
PULMONARY VEINS
LEFT ATRIUM
MITRAL VALVE
LEFT VENTRICLE
AORTIC VALVE
AORTA TO THE REST OF THE BODY!!