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The Heart

The Heart. Christina Routh And Taylor Hensley. The Heart. The heart is the pump of the circulatory system. It contracts to pump oxygenated blood to the body’s tissues, and pulls deoxygenated blood back to be re-oxygenated. . Blood Flow. The first step:

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The Heart

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  1. The Heart Christina Routh And Taylor Hensley

  2. The Heart • The heart is the pump of the circulatory system. • It contracts to pump oxygenated blood to the body’s tissues, and pulls deoxygenated blood back to be re-oxygenated.

  3. Blood Flow • The first step: • Oxygenated blood flows from the lungs through pulmonary veins. • Pulmonary veins are unusual because they carry oxygenated blood. Veins usually carry deoxygenated blood. • The blood enters the left side of the heart, and empties into the left atrium.

  4. Blood Flow • Step Two: • The blood flows through the left atrioventricular valve (bicuspid valve) from the left atrium. • From the atrioventricular valve it moves into the left ventricle. • Most of the blood enters the left ventricle when the heart is relaxed. The rest is filled when the heart contracts.

  5. Blood Flow • Step Three: • The ventricle then contracts. • When it contracts, the blood enters the aorta. • The aorta is the largest artery in the body. • The atrioventricular valve closes to prevent blood from pushing back into the atrium.

  6. Blood Flow • Step Four: • The blood travels from the aorta through the many arteries that branch off from it. • These arteries carry oxygenated blood to all the body tissues. • When the tissues receive the oxygen, they push deoxygenated blood that contains carbon dioxide into the veins to be carried back to the heart.

  7. Blood Flow • Step Five: • From the veins, the blood enters the right atrium of the heart through two veins. • The two large veins that collect blood after circulation are: • Superior vena cava: drains upper body • Inferior vena cava: drains lower body.

  8. Blood Flow • Step Six: • The blood then passes from the right atrium to the right ventricle through the tricuspid valve.

  9. Blood Flow • Step Seven: • Blood then passes through the right ventricle into yet another valve, the pulmonary semilunar valve. • Through this pulmonary semilunar valve it enters the pulmonary artery. This artery branches into several arteries which take deoxygenated blood to the lungs.

  10. Blood Flow • Step Eight: • The blood then returns from the lungs back into the left atrium, full of fresh oxygen and cleared of carbon dioxide. • The process is repeated.

  11. Test Questions • 1. Why are pulmonary veins unusual? • Their size. • They carry oxygenated blood. • They carry deoxygenated blood. • Their location.

  12. Test Questions • 2. Where does the blood enter the heart? • The left • The right • The top • The bottom

  13. Test Questions • 3. Most of the blood enters the left ventricle when the heart is relaxed. • True • False

  14. Test Questions • 4. The femoral artery is the largest artery in the body. • True • False

  15. Test Questions • 5. What carries blood from the tissues back to the heart? • Veins • Arteries • Capillaries

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