Blood is a mixture of liquid, called plasma is mostly water and contains nutrients. These nutrients include dissolved sugars, proteins, and gases. Most cells in blood are red blood cells, which are shaped like a dought without the hole. They contain chemical hemoglobin, which carries oxygen around your body. Blood also contains gemr- fighting white blood cells and platelets. When you have a cut, platelets help stop the bleeding by forming clots. Blood travels thought three Kinds of blood vessels- arteries, veins, and capillaries Arteries are blood vessels that carry blood away from your heart. Veins are blood vessels that carry blood back to your heart. Capillaries are where materials and body cells.
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