What does blood contain?

What does blood contain?

Blood is not the same in all people.
Classification of blood into groups that have the same characteristics is very important in order to ensure, during transfusion, compatibility
between donor and recipient.
Blood consists of a liquid part, plasma, and cells: erythrocytes, leukocytes, platelets.
On the surface of cells (especially red blood cells) there are substances known as antigens.

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