Red Blood Cells

  • These cells are needed to carry oxygen from the lungs to cells through out the body and take carbon dioxide back to be exhaled.
  • Red blood cells contain hemoglobin, an iron-containing protein that carries the oxygen and gives blood its red color.
  • Red blood cells make up 40 percent to 45 percent of blood.
  • Manufactured in the bone marrow, red blood cells are continuously produced and broken down in the circulatory system.
  • Red blood cells look like doughnuts with an indentation in the center instead of a hole.
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