Flashcards in Immunology and Public Health unit 4 Deck (14):
What is the immune system?
The Immune system protects the body from disese-causing-organisms, some toxins and cancer cells
Describe what is meant by immunity?
Immunity is the ability of the body to resist infection by a pathogen or to destroy the organism if it infects the body.
What are the two types of immunity?
Non-Specific and Specific
What does non specific immunity work against?
Any kind of disease causing agent
What is the skin made of and why?
layers of epithelial cells that form a protective barrier against bacteria and viruses
What do cells in mucous membranes do?
Secrete mucus to trap microorganisms
Secretions in tears and saliva contain the enzyme lysozyme, what does it do?
digests the cell walls of bacteria and destroys them
When does the inflammatory response occur?
When the body suffers a physical injury such as a cut and invasion by an microorganism
What do mast cells produce?
What does histamine cause?
Blood vessels to vasodilate and capillaries to become more permeable
Histamine is released by what and when?
When mast cells become activated
Additional supplies of blood does what to the injured area?
Makes the injured area red and inflamed as stretched capillary walls become more permeable and leak fluid into neighbouring tissue
What are cytokines?
Cytokines are cell-signalling protein molecules secreted by many types of cells, including white blood cells at the site of infection