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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