Download Endocardium

Circulatory
System
Heart Terms


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Myocardium – The muscle that forms the
heart wall. Creates the “beat” of the
heart.
Endocardium – A tough membrane that
lines the four chambers of the heart.
Pericardium – The sac or chamber that
encloses the heart.
Endocardium
Myocardium
Pericardium
More Heart Terms
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Septum – The inner wall that separates
the two halves of the heart.
Atrium – The upper chamber of the heart
(thin wall).
Ventricle – The lower chamber of the
heart (thick wall).
Why are the walls of
the ventricles thicker
than the walls of the
atriums?
Right Atrium
Left Atrium
Right Ventricle
Endocardium
Septum
Left Ventricle
Myocardium
Pericardium
Blood Vessels
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Arteries – blood vessels that carry blood
away from the heart.
Veins – blood vessels that carry blood
back to the heart.
Capillaries – blood vessels that connect
arteries to veins. Gas exchange occurs
in the capillaries.
Blood Vessels of the Heart
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Aorta – The largest artery, carries blood from
the left ventricle to the body.
Vena Cava – Blood from the body enters the
heart through this vein.
Pulmonary Artery – Carries blood from the
heart to the lungs (CO2 in blood).
Pulmonary Vein – Carries blood from the lungs
to the heart.
Aorta
Superior Vena
Cava
Pulmonary
Artery
Pulmonary
Vein
Right Atrium
Left Atrium
Right Ventricle
Endocardium
Septum
Left Ventricle
Myocardium
Pericardium
Valves

Flaps in the
heart that do
not allow
blood to flow
backwards
Heart Valves
Tricuspid – Between right ventricle and right
atrium
 Mitral – Between left ventricle and left atrium
 Pulmonary – Between right ventricle and
pulmonary artery
 Aortic – Between the left ventricle and the
aorta

Pulmonary
Mitral
Tricuspid
Aortic
The Right side of the heart carries
deoxygenated blood
The left side of the heart carries
oxygenated blood.
Let’s see the circulatory system in action!!!
Basic Blood Flow
Through the Heart
Blood Flow Video
Complex Blood Flow
Through the Heart
7th Grade - Heart