BIOL 1080 Study Guide - Final Guide: S Band
Document Summary
Mhc: the helper t-cell than can activate na ve b cell response, or na ve cytotoxic t cell response; they can be both activated at same time. valves (prevent blood flowing backwards: skeletal muscles relax and blood fills the valves and closes them, muscle contraction squeezes the vein pushing blood through the open valve towards the heart, varicose veins. neural conductions: gap junctions . are very fast and contract as a unit. aortic valve: between left ventricle and aorta. mitral valve: between right atria and ventricle y artificial heart valves: issues. resistance to flow (backflow: biological values. Electric signal is propagated by: y nodes (sa and av node) y nerves y. Miscommunications y abnormal sa node firing (too fast) y blocks can slow down or prevent signaling form atria to ventricles. Ventricles now contract independently y most serious is are fibrillations, when cells depolarize independently.