Line 2: Internal Defenses Flashcards
Neutrophils and macrophages use phagocytosis to engulf and kill pathogens
Phagocytes
“Police” the body in blood and lymph
Natural killer cells
Kill cancer cells and virus, infected body cells (not picky)
Natural killer cells
Kill by triggering the target cell to undergo apoptosis
Natural killer cells
Nonspecific response to any tissue damage
Inflammation
Begins with the release of histamine and other inflammatory chemicals
Inflammation
Triggers vasodilation (increased blood flow to an area)
Histamine
Attracts phagocytes (neutrophils and macrophages), which flood the area and phagocytose and destroy the pathogen producing pus
Histamine
Complement and interferons
Proteins
A group of proteins that circulate in the blood and become active when they encounter pathogens, killing them by puncturing their cell membranes
Complement system
Released by cells infected with the virus: triggering nearby cells to make a protein that helps them resist viral infection
Interferons
A sign that your body is fighting infection
Fever
When the white blood cells are exposed to foreign substances in the body, they release chemicals called???
Pyrogens
Trigger the hypothalamus to raise body temperature
Pyrogens
