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, and transports metabolic waste products away …

Jul 21, 2025 · Blood is a specialized fluid that constantly flows throughout your body. It’s made of plasma, red blood cells, white blood cells and platelets.

Dec 15, 2025 · Blood is a fluid that transports oxygen and nutrients to cells and carries away carbon dioxide and other waste products. It contains specialized cells that serve particular functions. These …

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

The main job of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs.

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% …

May 11, 2023 · Blood has many functions in your body. Blood tests help doctors check for certain diseases and conditions. Learn about blood types and blood tests.

3 days ago · In this week's episode, Blood editor Dr. James Griffin interviews authors Drs. Vincent Muczynski and Mark Geyer on their latest research published in Blood. Dr. Muczynski's research …

The body contains about 5 to 6 quarts (about 5 liters) of blood. Blood performs various essential functions as it circulates through the body: Once blood is pumped out of the heart, it takes 20 to 30 …

Aug 3, 2023 · Blood is a liquid connective tissue made up of blood cells and plasma that circulate inside the blood vessels under the pumping action of the heart.