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  1. Blood - Wikipedia

    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 …

  2. Blood | Definition, Composition, Functions, & Facts | Britannica

    Nov 7, 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 …

  3. Blood Basics - Hematology.org

    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 …

  4. 18.1 An Overview of Blood - Anatomy and Physiology 2e

    Recall that blood is a connective tissue. Like all connective tissues, it is made up of cellular elements and an extracellular matrix. The cellular elements—referred to as the formed …

  5. Understanding Blood and Blood Components | UMass Memorial …

    Learn about the 4 different parts of blood--red blood cells, white blood cells, platelets, and plasma.

  6. Overview of Blood

    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 …

  7. Blood: Composition, components and function | Kenhub

    Oct 30, 2023 · Blood is the most important transport medium in the human body. It transports gases (oxygen, carbon dioxide, nitrogen etc.) as well as nutrients (metabolism) and end …

  8. Blood type - Wikipedia

    Blood type Blood type (or blood group) is determined, in part, by the ABO blood group antigens present on red blood cells. A blood type (also known as a blood group) is a classification of …

  9. Home - NHS Blood Donation

    Register to be a blood donor, give blood and save lives. Find out more about blood donation.

  10. Virginia Community Blood Centers - Donate Blood - The Blood

    Save lives, earn rewards, and donate whole blood, plasma, or platelets today with the Blood Connection's Virginia Community Blood Centers!