Components of the Circulatory System: Blood, Blood Vessels, and Heart

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Components of the Circulatory System

The circulatory system consists of various components that work together to transport blood throughout the body. These components include:


  • Plasma: a liquid substance that carries nutrients and waste throughout the body.
  • Red blood cells: responsible for carrying oxygen and giving blood its red color.
  • White blood cells: protect the body from germs and diseases.
  • Platelets: help stop bleeding from wounds.

Blood Vessels

  • Arteries: carry blood from the heart to the capillaries.
  • Veins: carry blood from the capillaries back to the heart.
  • Capillaries: enter body cells to deliver nutrients and oxygen, and remove carbon dioxide and waste.


The heart is a muscular organ that pumps blood throughout the body via the blood vessels. It consists of:

  • Atria: where blood enters the heart.
  • Ventricles: where blood leaves the heart.

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