BI SC 004 Lecture Notes - Lecture 39: Abdominal Cavity, Mucous Membrane, Bone Marrow
Document Summary
Primary lymphatic organs: red bone marrow, site of blood cell production, some white blood cells mature here, b lymphocytes, thymus. Is a bilobed gland: found, between the lungs, above the heart. Immature t lymphocytes move from the marrow: moves to the thymus, this is where they mature, 95% will stay. Secondary lymphatic organs: lymph nodes, small, bean-shaped structures, found along the lymphatic vessels, filled with, b cells, t cells, macrophages, filter lymph fluid, common in the, neck, armpit, groin regions, spleen. In the upper left region of the abdominal cavity: filled with macrophages, filters the flood, screens for pathogens. What do the nonspecific defenses include: first line of defense, barriers to entry, physical, chemical, second line of defense, phagocytic white blood cells. The first line of defense: physical barriers, the skin is an effective physical barrier, things that physically flush out microbes, tears, saliva, urine, mucous membranes line the, respiratory, digestive, reproductive, urinary tracts, resident bacteria/normal flora:
