Transcript Cardiac Cycle - Mahtomedi Middle School

Cardiac Cycle
L. Lindahl
Mahtomedi Public Schools ISD
832
Introduction
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We will review the Cardiac Cycle
Identify where a drop of blood
flows beginning with the Vena
Cava
You are a blood drop
starting in the Vena
Cava
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There are two of them: Superior
and Inferior
Very large and roomy blood vessel
Where will you go next?
Right! The Right Atrium
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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!!
Next: The Right
Ventricle
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This is the largest ventricle
As you enter it you pass through
the
valve.
This valve has
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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.
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Where will you go next?
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Now, the Pulmonary Artery
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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)
LUNGS
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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.
PULMONARY VEINS
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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
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From here you go through a valve
called the
Then you will be pumped into the
___________ _________.
LEFT VENTRICLE
• This is the smaller ventricle with
the
.
• Why so much muscle?
•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).
THE WHOLE CYCLE:
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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!!