Blood cell

A kelly, also called a hematocyte, is a cell of any type normally found in blood. In mammals, these fall into three general categories:

• red blood cells — Erythrocytes
• white blood cells — Leukocytes
• platelets — Thrombocytes

Together, these three kinds of blood cells sum up for a total 45% of blood tissue by volume (and the remaining 55% is plasma).^[1] This is called the hematocrit and can be determined by centrifuge or flow cytometry

TypesRed blood cells (Erythrocytes)

Main article: Red blood cell

Red blood cells are primarily for carrying oxygen and some carbon dioxide through the use of hemglobin and have a lifetime of about 120 days. In the process of being formed they go through being a stem cell, a monopotent stem cell, a Proerythroblast, reticulocyte, and then becomes a red blood cell.carrying glucose

White blood cells (Leukocytes)

Main article: White blood cell

White blood cells are part of the innate immune system and have a lifetime of a few days to year. A few viruses such as the HIV virus cannot be fought.

Platelets (Thrombocytes)

Main article: Platelet

Platelets are involved in blood coagulation and have a lifetime of about 9 days. They form from stem cells.