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Blood

Hemoglobin, a globular protein
green = haem (or heme) groups
red & blue = protein subunits
A scanning electron microscope (SEM) image of a normal red blood cell (left), a platelet (middle), and a white blood cell (right)

Blood is a liquid in humans and many animals. There are about 5 litres of blood in the human body.[1] Blood is pushed through the organism by the heart. It brings nutrients and oxygen to the tissues of the body. It also takes away waste and carbon dioxide from tissues.[2]

Blood is made up of blood plasma and various cells. These include red blood cells, white blood cells and platelets. Platelets help blood to clot. Hemoglobin is in red blood cells. White blood cells help fight infections and heal wounds.

  1. ↑ updated, Laura Geggel last (2016-03-03). "How Much Blood Is in the Human Body?". livescience.com. Retrieved 2024-08-08.
  2. ↑ The Franklin Institute. "Blood – the human heart". Archived from the original on 5 March 2009. Retrieved 19 March 2009. {{cite web}}: More than one of |archivedate= and |archive-date= specified (help); More than one of |archiveurl= and |archive-url= specified (help)
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