The Heart

Explains about the heart structure, and the cardiac cycle.

  • Created by: Laura
  • Created on: 16-04-10 09:00

What Does the Heart do?

  • The heart is a muscular organ located in the thorax, which pumps blood continuously around the body.
  • The blood supplies cells with substances needed around the body for respiration; oxygen and glucose.
  • It also removes carbon dioxide, the waste product from respiration.
  • The heart can also, respond to increase demand for energy during exercise.
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Structure of the Human Heart.

  • The heart is divided into a left heart, (which receives oxygenated blood)and a right heart (contains de oxygenated blood) .
  • Each half consists of an upper atrium and a lower ventricle
  • Attached to the heart are some major blood vessels, veins feed blood into the atria.
  • The ventricles pushes the blood out of the heart through arteries.
  • The heart contains 4 valves, which make sure that blood flows in only ONE direction.
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Stages in the Cardiac Cycle.

  • Blood moves into the heart.
  • The left and right atria contract.
  • Blood moves up through the bicuspid and tricupsid valves.
  • The left and right ventricles contract.
  • Blood moves through the semilunar valves.
  • Blood enters the pulmonary artery and aorta.
  • Blood is pumped out of the heart and around the body.
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