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Scientific Term for Red Blood Cell. Lacking both a nucleus and organelles. Filled with hemoglobin.


Scientific Term for White blood cells.


Fragments of cells. Platelets play an important role in blood clotting.

Formed Elements

Any of the non-fluid, cellular parts of blood. Formed elements include: Erythrocytes, Leukocytes and Platelets.


Fluid Portion of Blood that contains many disolved molecules.


Most common Leukocyte. Specializes in defending body against bacteria. Attracted to areas of inflammation.


Leukocyte specialized for defending the body against parasitic worms.


Least common leukocyte. Stimulate release of histamine from cells around damaged tissues.


Leukocytes with a grainy texture or look to them. Include: Neutrophils, Eosinophils, and Basophils.


Leukocytes specialized for attacking/ defending against cells infected with virus or cancer.


Largest Leukocytes, act as macrophages against chronic infections.


Type of Leukocyte that appears smooth, not granular under microscope. Includes: Lymphocytes and Monocytes.


Process of creating new erythrocytes (red blood cells). Takes place in red bone marrow.

Erytrhopoietin (EPO)

Hormone released from kidney in response to decreasing blood oxygen leves.


Stoppage of bleeding due to injury to the blood vessals.


The percentage of blood made up of erythrocytes.

ABO Blood Groups

Blood typing based on the presence or absence of antigens on the surface of red blood cells.

Type AB Blood

Has both A and B antigens on surface of red blood cells and no antibodies. Can accept blood from any blood type - "Universal Recipient."

Type O Blood

Has no antigens on red blood cell surface. Type O blood can be given to anyone - "Universal Doner".

Type A Blood

Has A antigens on cell surface and anti-B antibodies.

Type B Blood

Has B antigens on cell surface and Anti-A antibodies.

Blood pH

Blood pH is slightly basic. Around 7.4.


Blood Plasma Protein that accounts for 60% of all plasma proteins. Albumin helps to protect molecules traveling in blood, regulate pH and regulate blood osmotic pressure.

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