A microorganism which parasitized an animal and produces a disease.
What are the two divisions of lymphocytes?
T cells and B cells
What is the role of a B cell
Produces circulating antibodies
What are the subdivisions of T cells?
Cytotoxic T cell and helper T cells
What are T cells responsible for?
Cell mediated immunity
What types of inflammation are there?
Chronic and acute
What is acute inflammation and what happens during it
- response to samage
- white blood cells enter tissue
- blood vessels dilate
- macrophages remove and consume dead cells
What is fever?
A rise in temperature above normal
What do cytotoxic T cells do?
- recognise peptide antigens
- destroy cancerous cells and virus infected cells
What do natural killer cells do and what are they?
- T cells
- Kill virus infected cells
- kill cancerous cells
Where do viruses replicate?
only in living cells
What are viruses composed of?
- core of nucleic acis
- protein shell
- some have outer lipid capsule
What is an antigen?
Any substance that can be specifically bound by an antibody.
What is a complement?
- functionally linked proteins
What do protein complements do?
Aid defences when antibodies bind with antigens
Lysis and oponization of foreign organisms
Inflammation and clearing immune complexes.
What is a helper T cell?
Type of T lymphocyte
What does a helper T cell do?
Recognises foreign antigens on the surface of antigen presenting cells
Stimulate the production of cytotoxic T cells