HLT 1353 Chapter Notes - Chapter 13: Innate Immune System, Epithelium, Microorganism

• School: University of Houston
• Department: Health Education
• Course: HLT 1353
• Professor: Robin Proctor

Document Summary

The body"s defe(cid:374)se syste(cid:373: pathogen: a microorganism that causes disease or infection. Skin and mucous membranes are made of epithelial tissue: 1+ layers of closely packed cells with almost no space between cells: fluids (tears, saliva, vaginal secretions) break down and destroy microorganisms. T cells and b cells: capable of exquisite specificity and immunological memory. Antigens and antibodies: body (cid:272)ells ha(cid:448)e surfa(cid:272)e (cid:373)arkers that ide(cid:374)tify the(cid:373) as (cid:862)self(cid:863) Invading microbes have surface (cid:373)arkers that ide(cid:374)tify the(cid:373) as foreig(cid:374)/(cid:862)(cid:374)o(cid:374)-self(cid:863: these markers (antigens) trigger an immune response, antibodies: specialized proteins that circulate the bloodstream and bind to antigens, tagging them for destruction. T cells differentiate into help t cells, killer t cells, or suppressor/regulatory t cells. Some b and t cells become memory b and t cells, which can mount a rapid and powerful response should they encounter the same invader in the future.