Unit K Notes #1:Heart Structure
Unit K Notes #1:Heart Structure
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A) Parts of the Heart (Arteries carry blood AWAY from heart, veins return to heart)
Left and Right Atria – Collecting Chambers
- Right: Collects blood from both Vena Cavae
- Left: Collects blood from Pulmonary Veins
Left and Right Ventricles – Pumps
- Right: Sends blood to the lungs via the Pulmonary Trunk Pulmonary Arteries
- Left: More muscular wall because more force must be exerted to send blood to the whole body (Systemic System). Blood is pumped out through the Aorta.
Atrioventricular -- Valves
- Valves found between the atria and ventricles
- Prevent backflow of blood.
- The AV valves on the right hand side “Tricuspids”—have three cusps, or flaps
-Left hand side “Bicuspid” – two cusps. Also called "Mitral" valve.
Chordae Tendineae
–Strong, Fibrous strings that support the A.V. Valves.
-Keeps the valves from inverting with the force of blood flow.
Picture below illustrates Mitral valve with Chordae Tendineae
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Semi-Lunar Valves
- One (Aortic Semilunar) is found between the L. Ventricle and the Aorta.
- Other (Pulmonary Semilunar) is found between the R. Ventricle and the Pulmonary Trunk.
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Pulmonary Trunk
- Branches off to form the Pulmonary Arteries
- Receives blood from the right ventricle.
Interventricular Septum
- The dividing inner wall of the heart.
- Separates the left and right sides of the Heart, prevents deoxygenated blood from mixing with oxygenated blood.
Read pp. 242-243
Do both sides of Heart Diagram
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Internal View Of Ventricular Septum:
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