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=Introduction=

White blood cells are like an army. They go after bacteria and other things that don’t belong in your body. They have special structures that help them fight. Also, they have unique ways of fighting diseases. If you didn’t have white blood cells, you wouldn’t be living right now.

What do White Blood Cells do?
White blood cells are produced in the bone marrow and they are the fighters in our body. They protect us from diseases and foreign invaders. White blood cells are like an army. They go after their enemies and try to get rid of them. The **neutrophils** are white blood cells that kill/digest bacteria, and the **eosinophils** attack and kill parasites, cancer cells, and help with allergic responses.

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toc Watch this video to learn more about what white blood cells do. __ [] __

Structures of White Blood Cells
Ever wonder what are the structures inside a white blood cell? Well, this cell has most of the things that living things have. White blood cells have a vacuole to store food, a membrane, and a nucleus. There are some things that white blood cells have but other kind of cells don’t. White blood cells have antibodies. **Antibodies** are a blood protein that is produced to respond to antigens. Additionally, white blood cells have **pseudopods,** these are covered with glue like chemicals so they can touch the bacteria fast.



How do White Blood Cells Recognize Diseases?
When pathogen enters your body, white blood cells will recognize the antigens quickly. Next, **lymphocytes** (they are the white blood cells that produce antigens which will help fight a disease) they are now going to grow/multiply so they can produce anti-bodies. Finally, antibodies will stick to the antigens and destroy them. According to www.abpischools.org,”The surface of every cell is covered with molecules that give it a unique set of characteristics. These molecules are called [|antigens]. Antigens are generally fragments of [|protein] or carbohydrate molecules. There are millions of different antigens and each one has a unique shape that can be recognised by the white blood cells of your immune system. The white blood cells then produce antibodies to match the shape of the antigens.

How do White Blood Cells Fight a Disease?
The way white blood cells fight a disease is the lymphocytes (the cells that produce antigens) grow and multiply and make antibodies so now the antibodies will stick to the antigens and destroy them **.Antigens** are molecules that the immune system recognize when they're coming outside of your body. Here’s an animation that shows how white blood cells fight diseases.

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What is the Difference Between White Blood Cells and Red Blood Cells?
Like I said before, white blood cells are the fighters in our body. They fight bacteria or any kind of disease that might be coming in. But red blood cells do something different. Red blood cells carry oxygen but the white blood cells don’t. Red blood cells don’t have nucleus like white blood cells do. The nucleus controls the actions of the cell. So it’s like a boss. It tell you what to do. Red blood cells are responsible for picking up carbon dioxide and transport it to oxygen.



Conclusion
White blood cells are also like an ambulance. They rush to the scene. White blood cells get to the scene right away when there is bacteria that needs to get out of the body. If you didn’t have white blood cells than you wouldn’t be living right now.So don’t take white blood cells for granted, when a disease enters your body, white blood cells are responsible for making us healthy again.

“What Are White Blood Cells?” University of Rochester Medical Center. N.p., 23 Feb. 2016. Web. 23 Feb. 2016. .
“What Do White Blood Cells Do?” med-health.net. N.p., 22 Feb. 2016. Web. 22 Feb. 2016. . “What is the Difference Between Red and White Blood Cells?” http://www.wisegeek.org/. N.p., 2003. Web. 22 Feb. 2016. . “White blood cells.” http://www.abpischools.org.uk/. N.p., 2016. Web. 22 Feb. 2016. . “What’s blood.” kidshealth.org. N.p., n.d. Web. 17 Feb. 2016. .