Stem Cells     Red Blood Cells       White Blood Cells

Platelets        Plasma        Blood Types & Activity


All of the blood cells in your body are produced in your bones, inside the bone marrow.

Bone marrow is produced in
Bone marrow looks like a network of connected caves

Stem cells form in bone marrow

Bone marrow looks like a network of tiny little connected caves, similar to a honeycomb. Inside, are some very special parent cells called stem cells. A stem cell can divide itself and produce a twin. This process of cell division called mitosis. Through mitosis, the stem cell can keep on creating more and more stem cells just like itself.

Process of Cell Division or "Mitosis"

A stem cell can develop into all the other different blood cells as well. The stem cell can actually differentiate into red cells, white cells and platelets. Inside the cell, a structure called the nucleus acts very much like a computer program.

It directs the cell to produce a special protein called hemoglobin. And it's this hemoglobin that makes red cells look red and gives them the ability to attract and transport oxygen.


After the red cell is full of hemoglobin, the job of the nucleus is done and it gets kicked out. Then, the mature red cell has a little dip in its middle on both sides.


At this point, the red blood cell leaves the bone marrow and begins to circulate in the bloodstream.


Through mitosis, stem cells can also become many different kinds of white cells.


White cells are an extremely important part of the body's immune system because they guard the body against infections and diseases.


Stem cells can also become many platelets. Platelets are extremely important in helping blood clot when a cut is made. The stem cell turns into a factory cell called a megakaryocyte. This is a very large cell with several nuclei.


The megakaryocyte never leaves the bone marrow, but does produce many, many fragments. These fragments are actually the platelets: small pieces of cell material or cytoplasm. And they do leave the bone marrow and circulate freely in the bloodstream.


In addition to continuing to produce all the cells in your own body, stem cells are also extremely important in medicine and research.


People who need a bone marrow transplant because they are ill with a disease such as leukemia or cancer, may receive new stem cells from the healthy bone marrow of a volunteer donor through a transfusion.   When a bone marrow transplant does take place, it is only the liquid part of the marrow that is donated, not the bone. It is hoped that with this treatment, their own bodies will begin producing a healthy variety of blood cells again.



Some terms I got from the movie are platelets, plasma, bone marrow stem cell mitosis, nucleus, oxygen and fibrin.
— Susanna,
elementary school student
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