immune system
- Created by: amandacygal
- Created on: 20-03-15 15:42
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- immune system.
- pathogens- microorganisms that cause infections or disease eg: bacteria and virus
- viruses: live in host cells and replicate whithin them damaging the cell- eventually the host will burst open and passed through bloodstreams, airways etc.
- bacteria: Bacteria are living cells and, in favourable conditions, can multiply rapidly. Once inside the body they release poisons or toxins that make us feel ill.
- antibodies and antigens
- antibodies are made by b-lymphocytes from the white blood cells.
- antibodies recognise foreign chemicles and cells which are known as antigens which they then engulf or destroy
- each antigen has a specific shape and requires its own antibody- white blood cells activate this process for a specific antibody to be made to attatch to an antigen.
- antibodies recognise foreign chemicles and cells which are known as antigens which they then engulf or destroy
- antibodies are made by b-lymphocytes from the white blood cells.
- pathogens- microorganisms that cause infections or disease eg: bacteria and virus
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