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The Heart

The Heart. ( Lub dub, lub dub). Heart Parts. You will need to be able to label the following parts of the circulatory system AND know what their “job” is: Left and right atrium Left and right ventricle Aorta Superior vena cava Inferior vena cava Pulmonary artery Pulmonary vein.

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The Heart

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  1. The Heart (Lub dub, lub dub)

  2. Heart Parts • You will need to be able to label the following parts of the circulatory system AND know what their “job” is: • Left and right atrium • Left and right ventricle • Aorta • Superior vena cava • Inferior vena cava • Pulmonary artery • Pulmonary vein

  3. The best way to learn the parts is to learn the path…and remember that ARTERIES take blood away from the heart. • We will begin with: • The Vena Cava – There are two of them. The superior vena cava brings blood from the upper part of the body back to the heart. While the inferior vena cava brings blood from the lower part of the body. (Find both on your diagram) • The vena cava enter the right atrium and they deliver the deoxygenated blood.

  4. The Right Atrium • Receives deoxygenated blood from the vena cava. • The right atrium sends the blood into the right ventricle (Find on the diagram) Note that there is a valve between the two chambers, this is to prevent blood from flowing in the wrong direction • The Right Ventricle • Receives the deoxygenated blood from the right atrium. • The right ventricle pumps the blood into the Pulmonary artery

  5. The Pulmonary Artery carries blood to the Lungs. (Find it) • The blood will be oxygenated in the lungs. • Small capillaries lining the alveoli allow this to happen. • The Pulmonary vein • Carries oxygenated blood back to the heart. • It enters the left atrium. (Find them)

  6. Left Atrium • Receives the oxygenated blood from the lungs (via the pulmonary vein) • Pumps the blood to the left ventricle • There is valve between the two chambers • Left Ventricle • Receives blood from the left atrium • Pumps the oxygenated blood out of the heart and in to the Aorta

  7. The Aorta is the largest artery in the body • It carries oxygenated blood to the body • It branches of into smaller arteries, which become arterioles, which become capillaries • Capillaries deliver the oxygen (and other supplies) directly to the cell.

  8. Capillaries • These also pick up the deoxygenated blood and start it on the return trip back to the heart. • Venules, veins and vena cava • These become larger and are returning the blood to the heart.

  9. Systemic Circulation • This is the circulation of blood through the body, to the cells and back again • Pulmonary Circulation • This is circulation of blood between the heart and lungs.

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