Blood Anatomy

Main Components

Blood has four main parts.


  1. Plasma- the liquid part of blood that carries nutrients and hormones throughout the body. It makes up 55% of the blood.
  2. Red Blood Cells- most numerous type of blood cell, carry Oxygen and Carbon Dioxide gases which bind to Hemoglobin proteins. They make up about 45% of blood.
  3. White Blood Cells- fight off disease and foreign invaders.
  4. Platelets- cell fragments that assist in blood clotting.
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