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 and Inferior
Very large and roomy blood vessel
Where will you go next?

4. Right! The Right Atrium TOP
You just entered one of the __________ chambers of the heart.
You are separated from the rest of the chambers by a valve. Valves help to: prevent blood from flowing backwards!!

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
The _____________ is the muscle that runs up and down in the center of the heart.
Where will you go next?
tricuspid valve
three flaps
septum

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. Particles move from high to low concentration
LUNGS
You enter the lungs and here you get rid of your
and replenished with
This happens because of a process called
What is diffusion??:
__________________________________________
___________________ surround the air sacs in the lungs and are very thin. They connect the arteries to the veins.
carbon dioxide
oxygen
diffusion
Particles move from high to low concentration
capillaries

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. it has to pump blood to the whole body and that takes muscle
LEFT VENTRICLE
This is the smaller ventricle with the .
Why so much muscle?
most muscle
it has to pump blood to the whole body and that takes muscle

11. Then you go to the so you can be pumped out to 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 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!!