PSL300H1 Lecture Notes - Lecture 2: Lysosome, Mast Cell, Vascular Permeability
Document Summary
Key features of immune system are specificity and memory. 3 major functions: protects body from disease causing invaders known as pathogens (bacteria, virus, fungi, protozoans, multicellular parasites). Substances that trigger the body"s immune response and can react with products of that response are known as antigens: removes dead or damaged cells, recognize and remove abnormal cells. 1: overactive response (allergies, lack of response (immunodeficiency disease) Bacteria and virus difference in many ways, so body need different immune response. Most can survive and reproduce outside host if they have required nutrients, temp, ph etc. Consists of nucleic acid core with capsid (protein coat). Some have an envelope of phospholipid and protein. Must use host cell to replicate and reproduce. Can be inhibited by antiviral drugs that target their replication. Inside, virus nucleic acid takes over the host cells resources to make new viral nucleic acid and proteins. They then form the mature virus and lyses.