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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