HSS 1100 Lecture 2: Week 2 - Immunity.docx

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 1100
• Professor: William Yan

Document Summary

P. 13 parasitic infections march 3rd (switched weeks) Immunity = the protection against infectious disease conferred either by the immune response generated by immunization or previous infection or by other nonimmunologic factors a. k. a. body"s ability to resist infection. Acid ph: sebaceous secretions and sweat contain unsaturated fatty acids (bactericidal) Lower temperature that is suboptimal for some bacteria. Cilia in respiratory tract eliminate particles larger than 5 microns (ex. large bacteria- carrying dust particles) Gastric juice ph, acid ph in vagina, urine) Some bacteria require iron for growth (cell function) Polymorphonuclear (pmns), monocytes and macrophages in the tissues engulf and eventually destroy bacteria. Complement complicated reaction of immune system that recognized pathogens as foreign and cells are sent to destroy them. Mechanisms aimed at particular infecting organisms are divided into two major systems: humoral specific circulating antibodies in body fluids, cell-mediated (cmi) cells trained to attack specific invading organisms.