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Blood Facts

On average, the adult human body has about 1.4 gallons of blood.

Blood is made up of four main components: Plasma (55%), Red blood cells (40%), Platelets (4%), and white blood cells (1%).

The bone marrow is where 95 percent of a person's blood cells are generated.


Plasma in the blood is composed of 90 percent water.

Blood makes up almost 10 percent of a person’s body weight.

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Human blood contains a variety of metal elements including iron, chromium, zinc, manganese, lead, copper, and even gold.

There is no nucleus, mitochondria, or ribosomes in mature red blood cells. This allows it to carry a little more hemoglobin.

Different blood cells have different life spans. RBCs have 4 months, Platelets have 9 days and WBCs have a few hours to some days.  

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