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Heart Facts

Heart Facts

Heart Facts
  • The heart is made of muscle.
  • The blood from the heart carries oxygen to all parts of the body.
  • The blood vessels, called arteries, carry the oxygen-rich blood.
  • The job of the heart is to pump blood throughout the body.
  • The heart needs its own oxygen supply to survive.
  • When the heart works hard, it needs a larger supply of oxygen.

The Heart: Chamber and Valves

  • The heart has four chambers.
  • The atria (upper chambers) receive blood into the heart.
  • The ventricles (lower chambers) pump blood out of the heart.
  • There are four valves in the heart.
  • The valves act as one-way doors to keep the blood flowing in the same path.
  • The septum is a wall that divides the heart into right and left sides.

The Heart: Right and Left Sides

  • The right side of the heart receives oxygen-poor blood from the body.
  • The oxygen-poor blood is then pumped to the lungs.
  • While the blood is in the lungs, it picks up a new supply of oxygen.
  • The left side of the heart receives oxygen-rich blood from the lungs.
  • The oxygen-rich blood is pumped to the body by the left ventricle.
  • The aorta carries the oxygen-rich blood out of the heart from the left ventricle.
  • The left ventricle does most of the heart's pumping work.

The Heart: Coronary Arteries

  • The heart receives its supply of oxygen-rich blood through the coronary arteries.
  • The coronary arteries lie on the surface of the heart.



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