Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells of the body, and transports metabolic waste products away from those same cells. [1] Blood is composed of blood cells suspended in plasma. Blood is a fluid that transports oxygen and nutrients to cells and carries away carbon dioxide and other waste products.

Understanding the Context

It contains specialized cells that serve particular functions. These cells are suspended in a liquid matrix known as plasma. Red pee, or what appears to be blood in urine, has many causes. Here's how to tell if it's harmless or a sign of a more serious issue.

Key Insights

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Final Thoughts

Stefan Constantinescu, Ann Mullally, and Marina Kremyanskaya. Blood is a specialized fluid that constantly flows throughout your body. It’s made of plasma, red blood cells, white blood cells and platelets. It has four main components: plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole blood—a mixture of about 55% plasma and 45% blood cells. About 7% to 8% of your total body weight is blood.

Detailed information on blood, including components of blood, functions of blood cells and common blood tests.