HLTB21H3 Study Guide - Final Guide: Central Nervous System, Tuberculosis, Sylvatic
Document Summary
Definitions: parasites organism that grows, feeds, and is sheltered on or in a different organism and that does not contribute to the survival of its host. Unable to survive on their own, depends on host: virus ultimate micro-parasite smaller than bacteria; neither cells nor organisms; can only reproduce within their host. 10 times magnification to be seen, electrical microscope: macro-parasites composed of many cells; cycles through transmission stages (eggs and larvae) which pass into the external environment. Ex: malaria lives in humans but needs a vector to survive/transport to humans. Can be seen with the naked eye; can live in their host or live in their host or live on surface. Light microscope; do not multiply within host -> lay eggs outside, then come back in to cause harm to the host: transmission - movement of a parasite from host to host. Must occur for pathogen to survive: incubation period, interval of time required for development of a disease.
