1. Structure & Function Heart

2. Structure of Heart
The heart is surrounded by a fluid filled membrane called the PERICARDIUM
Fluid prevents friction between the outer wall and the covering of the membrane, so the heart can beat freely

3. Heart Chambers
Top Chambers are the left and right ATRIA (singular atrium)
Bottom Chambers are the left and right VENTRICLES
atrium walls are thin because only needed to pump blood to bottom chambers

4. Structure & Function of the Heart
Right Side
receives deoxygenated blood from body
this side pumps this blood to the lungs through the pulmonary arteries
pulmonary arteries are the only arteries in body that contain blood that is low in oxygen
Left Side
receives oxygenated blood from the lungs
blood returns to heart from the lungs through the pulmonary veins
pulmonary veins are the only veins in body that contain blood high in oxygen
this side pumps blood through left atrium & left ventricle to the body via the aorta
You will make your own diagram!!!

5. Superior Vena Cava
Large blood vessel that returns deoxygenated blood from the head, neck, and arms to the heart.
Inferior Vena Cava
Vessel that carries deoxygenated blood from lower body to the heart
Pulmonary Artery
Carries deoxygenated blood from the heart to the lungs
Pulmonary Veins
Carries oxygenated blood from lungs back to heart
Aorta
Carries oxygenated blood to the entire body
The largest artery

6. Heart Valves
A system of valves prevent blood from moving backwards through the heart
Atrioventricular valves (AV valve) separate the atrium and ventricle
Semilunar valves (SL valve) separate ventricles from pulmonary artery and aorta
Semilunar Valve
(Pulmonary Valve)
Semilunar Valve
(Aortic Valve)
Atrioventricular Valve
(Bicuspid Valve)
Atrioventricular Valve
(Tricuspid Valve)

7. The Heartbeat
The contraction of the atria is controlled by a small pocket of nerve cells called the sinoatrial (SA) node
= pacemaker
Causes a the atrioventricular (AV) node to send a signal to make the ventricles contract

8. Heart Sounds Heart sounds caused by the closing of the valves
Creates “lub-dub” sound!
”lub” closing of AV valve
”dub” closing of SL valve
Semilunar Valve
(Pulmonary Valve)
Semilunar Valve
(Aortic Valve)
Atrioventricular Valve
(Bicuspid Valve)
Atrioventricular Valve
(Tricuspid Valve)