Immune System Crossword

3. Y-shaped protein that recognize antigen and make them harmless. Key in humoral immunity.
5. A category of white blood cells that mature in the bone marrow and are involved with humoral immunity of antibodies.
6. A category of white blood cells that mature in the thymus and are involved with cellular immunity.
10. The general name of cells in the body involved with defending the immune system.
12. The reason why the liquid inside the substance can kill bacteria and why things taste sour.
14. Certain type of white blood cell that creates antibodies.
15. A type of t-cell that recognizes a germ and calls for help.
16. Protein that is a key building block of skin.

1. A type of t-cell that hears the call for help and kill the germs.
2. A thick, whitish-yellow fluid that made up of dead white blood cells and junk consumed by these white blood cells. It commonly a sign that a foreign or harmful substance has encountered the immune system.
3. Certain type of enzyme found in tears that help break down bacteria.
4. Certain type of white blood cell that stay in the body after the disease is gone to protect the body from the same harmful substance in the future. If the same germs appear, these cells signal for other cells.
7. Germs that cause disease in the human body.
8. The type of immunity response involving t-cells and cytotoxic t-cells.
9. The process of eating harmful substances by a certain type of white blood cells made in the bone marrow.
11. Toxic substance released by pathogen that antibodies bind to.
13. The type of immunity response involving antibodies and b-cells.