BIOLOGY Lecture Notes - Lecture 1: Cytotoxic T Cell, Adaptive Immune System, Natural Killer Cell
Document Summary
Overview of immune system (part-i: the immune system is the body"s defense mechanism against infectious organisms and other harmful substances. Innate immunity is the body"s first line of defense, and it includes physical barriers like the skin and mucous membranes, as well as immune cells like natural killer cells, neutrophils, and macrophages. Adaptive immunity, on the other hand, is a more specific and targeted response that develops over time as the body is exposed to different pathogens. However, it can also malfunction and cause autoimmune diseases, allergies, and other conditions when it mistakenly attacks healthy tissues or fails to recognize harmful substances. Maintaining a healthy lifestyle, getting enough sleep, and avoiding exposure to harmful substances can help support a strong and healthy immune system: the immune system is highly adaptable. Pathogens can change their surface antigens, which are the markers that the immune system uses to recognize them.
