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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
Superficial arteries and veins of face and scalp, cardiovascular system, human anatomy, (Netter replacement project - SSC)
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17 Questions About Health and Wellness Answered
Lateral view of an adult bedbug, Cimex lectularius, as it was in the process of ingesting a blood meal from the arm of a voluntary human host. Photo dated 2006.
8 Animals That Suck (Blood)
Diagram showing human heart
What’s the Difference Between Veins and Arteries?
Transfused Human blood in storage
The Strange, Grisly History of the First Blood Transfusion
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blood: Media

biochemistry
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Videos

Function of red blood cells explained
In a circuit through the cardiovascular system, red blood cells transport oxygen...
Video: Encyclopædia Britannica, Inc.
Observe how a red blood cell travels from the heart to the lungs and other body tissues to exchange oxygen and carbon dioxide
In a circuit through the cardiovascular system, red blood cells transport oxygen...
Video: Encyclopædia Britannica, Inc.
How much blood is in the human body?
And how much do you really need?
Video: Encyclopædia Britannica, Inc.
Why is blood red?
Are you “red-y” to find out?
Video: Encyclopædia Britannica, Inc.
Learn about sickle cell anemia and how a tiny microfluidic device can help analyze the behaviour of blood from sickle cell patients
How a tiny device can help predict the behaviour of sickle cells.
Video: © Massachusetts Institute of Technology (A Britannica Publishing Partner)
Observe the human immune response phagocytosis
Learn about the human immune response phagocytosis by watching time-lapse photography...
Video: Encyclopædia Britannica, Inc.
Why you should know your cholesterol levels
There are two major protein complexes that transport cholesterol through the bloodstream:...
Video: Encyclopædia Britannica, Inc.
Know the process of how blood donation works and its significance
Learn how blood donation works.
Video: © Behind the News (A Britannica Publishing Partner)
Learn about the oxygen-transporting function and molecular structure of the protein hemoglobin
Hemoglobin is an example of a globular protein. Learn how hemoglobin proteins in...
Video: Encyclopædia Britannica, Inc.

Images

blood components diagram
Blood is made up of multiple components, including red blood cells, white blood cells,...
Encyclopædia Britannica, Inc.
blood plasma
Blood sediment in test tubes, showing plasma (clear fluid), red blood cells (red),...
© Y tambe
red blood cell
Human red blood cells.
© Studio29ro/Dreamstime.com
bone marrow smear showing myelocytes
Bone marrow smear showing a cluster of erythroid cells (A), neutrophilic myelocytes...
Uniformed Services University of the Health Sciences (USUHS)
hemoglobin tetramer
Two αβ dimers combine to form the complete hemoglobin molecule. Each heme group contains...
Encyclopædia Britannica, Inc.
Macrophage structure
Macrophages, the principal phagocytic (cell-engulfing) components of the immune system,...
Encyclopædia Britannica, Inc.
MRSA and neutrophil
Four methicillin-resistant Staphylococcus aureus (MRSA) bacteria (purple)...
National Institute of Allergy and Infectious Diseases/Centers for Disease Control and Prevention (CDC)
human lymphocyte
Human lymphocyte (phase-contrast microphotograph).
Manfred Kage/Peter Arnold
human T cell; human T lymphocyte
A scanning electron micrograph of a T cell (T lymphocyte) from the immune system...
NIAID
platelet
A micrograph of a round aggregation of platelets (magnified 1,000×).
Dr. F. Gilbert/Centers for Disease Control and Prevention (CDC) (Image Number: 6645)
blood storage and blood transfusion
Human blood stored for use in transfusion.
© Vladm/Dreamstime.com
blood cells in sickle cell anemia compared with healthy red blood cells
Healthy human red blood cells (left) compared with red blood cells from a person...
(Left) Micro Discovery/Corbis; (right) NASA
Examples of extracellular fluids include lymph and plasma.
Encyclopædia Britannica, Inc.
the blood coagulation cascade
Figure 1: The blood coagulation cascade. Each protein circulates in the...
Encyclopædia Britannica, Inc.
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