Immune System

4. signaling molecules that attract and direct the movement of various immune system cells
6. contain viruses, bacteria, fungi, protozoa, and worms
8. macrophages and mast cells respond rapidly to damaged tissue or infection
9. cells that arrive later to the scene, but hold interest longer
10. warn healthy cells that a virus is coming
11. cells that are fast to the scene, but lose interest quickly
13. perforins cause pores to form in target-cell membranes, allowing granzymes to enter
15. regulate interactions between WBC and other cells

1. stimulates immune cells to initiate an inflammatory response
2. aka innate immunity; provide immediate protection against enemies
3. histamine and other compounds released by mast cells increase capillary permeability
5. aka acquired immunity; highly specific for distinct macromolecules
7. develop from precursor cells in the bone marrow and form monocytes
12. the study of internal defense systems of humans and other animals
14. large diverse group of peptides and proteins that serve as important signaling molecules and perform regulatory functions