BIOL 1202 Chapter : Immune System
Document Summary
Immune system: innate defenses, nonspecific external barriers, e. g. , skin, mucous membranes. Inhospitable environment for growth: dry, dead cells at surface. Sweat/sebaceous glands secreting acids and natural antibiotics like lactic acid: mucous membranes. Respiratory and digestive tracts: cilia (such as in trachea) prevent dirt/dust from moving to your organs (such as lungs, well-defined. If microbes swallowed, acids and protein-digesting enzymes destroy them: nonspecific internal defenses, phagocytic cells (macrophage, white blood cells (wbc) in extracellular fluid, amoeboid shape, destroy microbes by phagocytosis (cells encircle microbe with pseudopods, vacuole/lysosome compound destroys it) Lymph stream: interstitial, natural killer cells, wbc that destroy body cells infected by viruses and cancerous cells by punching holes in them, inflammatory response. Cell which detects invader begins replicating to fight the invasion. B cells (bone- humoral: grow up/mature entirely in the bone marrow and become functional. 3: poison ivy- oil changes orientation of cell proteins which.
