BSCI 202 Lecture Notes - Lecture 2: Lymphatic Vessel, T Helper Cell, Cytotoxic T Cell

• School: University of Maryland
• Department: Biological Sciences Program
• Course: BSCI 202
• Professor: Tammantha O

Document Summary

The lymphatic system: consists of two parts, lymphatic vessels, lymphoid tissues and organs, lymphatic system functions, transports escaped fluids back to the blood, essential role in body defense and resistance to disease, also role in digestion. Developmental aspects of the lymphatic system and body defenses. Except for the thymus and spleen, the lymphoid organs are poorly developed before birth: baby is really relying on mom. Newborn has no functioning lymphocytes at birth, only passive immunity from the mother. If lymphatics are removed or lost, severe edema results, but vessels may grow back in time. Without them the tissue swells or dies. Spleen, lymph nodes, tonsils, adenoid, appendix, peyer"s patches (s p l a a t) They are a collection of white blood cells. Collections of b cells, t cells, and macrophages (m t b stadium) Function to trap microorganisms and foreign particles: also, works to expose them to leukocytes in high concentrations. Spleen and lymph nodes filter blood and lymph.