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blood
Table of Contents
References & Edit History Related Topics
Images & Videos
Blood plasma
Observe a red blood cell as it travels from the heart to the lungs and other body tissues
Function of red blood cells explained
How much blood is in the human body?
Why is blood red?
Blood components Red blood cell Myelocytes in bone marrow Hemoglobin tetramer
Learn about sickle cell anemia and blood behavior in sickle cell patients
For Students
blood summary
Quizzes
Superficial arteries and veins of face and scalp, cardiovascular system, human anatomy, (Netter replacement project - SSC)
The Human Body
Read Next
Transfused Human blood in storage
The Strange, Grisly History of the First Blood Transfusion
Diagram showing human heart
What’s the Difference Between Veins and Arteries?
pulmonary veins and arteries, circulation, cardiovascular system, human anatomy, (Netter replacement project - SSC)
13 Questions About How the Human Body Works 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)
Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health
17 Questions About Health and Wellness Answered
Discover
Nazi Germany, Nazi SS troops marching with victory standards at the Party Day rally in Nuremberg, Germany, 1933. (Schutzstaffel, Nazi Party, Nurnberg)
Why Was Nazi Germany Called the Third Reich?
Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.
What is Holy Week?
Two chicks near an egg with a white background (poultry, chick, chickens, birds).
What Do Eggs Have to Do with Easter?
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?
Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.
Timeline of the Titanic’s Final Hours
Currency. Money. Cash. Dollars. Bills. Pile of ten, twenty, fifty, and hundred dollar bills.
6 Questions About the History of Money and Banking Answered
July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.
Will Light-Speed Space Travel Ever Be Possible?

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biochemistry
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Videos

Observe a red blood cell as it travels from the heart to the lungs and other body tissues
In a circuit through the cardiovascular system, red blood cells transport oxygen...
Video: Encyclopædia Britannica, Inc.
Function of red blood cells explained
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 blood behavior in sickle cell patients
How a tiny device can help predict the behavior 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 plasma
Blood sediment in test tubes, showing plasma (clear fluid), red blood cells (red),...
© Y tambe
Blood components
Blood is made up of multiple components, including red blood cells, white blood cells,...
Encyclopædia Britannica, Inc.
Red blood cell
The major component of human blood is the red blood cell
© Studio29ro/Dreamstime.com
Myelocytes in bone marrow
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)
Monocyte
A microscopic image of human blood showing a monocyte (purple), a type of white blood...
© JosLuis/stock.adobe.com
Human lymphocyte
A phase-contrast microphotograph of a human lymphocyte.
Manfred Kage/Peter Arnold
Human T cell
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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