Immune Sytem

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Which substances may form in the human body due to invaders entering the blood?

What is a major difference between red blood cells and white blood cells?

Bacteria and dead cells are removed from circulatory fluid in the

The chemical that causes the allergic response during an asthma attack is

A protein on the surface of HIV can attach to proteins on the surface of healthy human cells. These attachment sites on the surface of cells are known as

Certain microbes, foreign tissues, and some cancerous cells can cause immune responses in the body because all three contain

A vaccine used against an infectious disease may contain

Which transplant method would prevent the rejection of tissue after an organ transplant?