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The Heart

March 4, 2012

Here is a short video that explains how blood flows through the heart.

Quick overview of major parts of the heart:

  • Vena cava- Superior & Inferior– Where deoxygenated blood enters the heart.
  • Right Atrium- Deoxygenated first enters right atrium, one of the four major chambers in the heart. Also pushes blood into right ventricle.
  • Tricuspid Valve- Valve between right atrium and right ventricle, opens and closes to regulate flow of blood from right atrium to right ventricle.
  • Right Ventricle- Receives deoxygenated blood from the right atrium. Also one of the four major chambers in the heart, and pushes blood into the pulmonary artery.
  • Pulmonary Valve- Valve between right ventricle and pulmonary artery, opens and closes to regulate flow of blood from right ventricle to pulmonary artery.
  • Pulmonary Artery- Receives and carries the deoxygenated blood from the right venticle to the lungs.
  • Pulmonary Arteriole- Smaller blood vessels of the pulmonary artery that carry the deoxygenated blood.
  • Pulmonary Capillaries- Even smaller blood vessels that connect the arterioles with the venules and allow for the exchange of nutrients. This exchange in nutrients allows the blood to become oxygenated.
  • Pulmonary Venule- Small blood vessels that take the oxygenated blood from the capillaries and connect to the main pulmonary vein.
  • Pulmonary Vein- Carries the oxygenated blood from the lungs into the left atrium.
  • Left Atrium- Another of the four chambers of the heart. The left atrium holds the oxygenated blood it receives from the pulmonary vein and pushes it into the left ventricle.
  • Mitral Valve- Valve between the left atrium and ventricle. Opens and closes in sync with tricuspid valve to allow blood flow from left atrium to left ventricle.
  • Left Ventricle- Also one of the four major chambers of the heart, receives oxygenated blood from left atrium and pushes it into aorta.
  • Aortic Valve- Valve between left ventricle and aorta. Opens and closes in sync with pulmonary valve and allows blood to flow from left ventricle to the aorta.
  • Aorta- Largest artery in body, carries oxygenated blood to all parts of the body.
  • Coronary Artery- Carries oxygen rich blood to the heat muscle, connects to the aorta.
  • Coronary Vein- Takes the blood from muscular tissue of the the heart and puts it into the coronary sinus
* Not included in video or picture.
  • S.A. Node- Located in the right atrium, the S.A. node is a cluster of neurons that controls the contractions of both the right and left atrium.
  • A.V. Node- Is also a cluster of neurons. It is located in the right ventricle and is set off by the S.A. node. The A.V. node controls the contractions of both ventricles.

Click to enlarge

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