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blood
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Function of red blood cells explained
Observe how a red blood cell travels from the heart to the lungs and other body tissues to exchange oxygen and carbon dioxide
How much blood is in the human body?
Why is blood red?
blood components diagram blood plasma red blood cell bone marrow smear showing myelocytes hemoglobin tetramer
Learn about sickle cell anemia and how a tiny microfluidic device can help analyze the behaviour of blood from sickle cell patients
For Students
blood summary
Quizzes
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13 Questions About How the Human Body Works Answered
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The Strange, Grisly History of the First Blood Transfusion
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blood components diagram
blood components diagram Blood is made up of multiple components, including red blood cells, white blood cells, platelets, and plasma.

blood

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Written by
C. Lockard Conley
Distinguished Service Professor Emeritus of Medicine, Johns Hopkins University and Hospital, Baltimore, Maryland; Head, Hematology Division, 1947–80. Contributor to Medical Physiology.
C. Lockard Conley,
Robert S. Schwartz
Professor of Medicine, Tufts University, Boston; former Chief, Division of Hematology-Oncology, New England Medical Center.
Robert S. Schwartz•All
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Last Updated: • Article History

blood, fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products. Technically, blood is a transport liquid pumped by the heart (or an equivalent structure) to all parts of the body, after which it is returned to the heart to repeat the process. Blood is both a tissue and a fluid. It is a tissue because it is a collection of similar specialized cells that serve particular functions. These cells are suspended in a liquid matrix (plasma), which makes the blood a fluid. If blood flow ceases, death will occur within minutes ...(100 of 11069 words)

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