human defence system Flashcards
1
Q
what are the three different parts of the defence system
A
- the general barrier
- non specific defences
- specific defences
2
Q
what is the general barrier purpose
A
it serves as the first line of defence for the body and to prevent organisms from entering
3
Q
examples of general barriers in the body
A
- skin and mucous that line the respiratory passages serve to keep out microbes
- stomach acids, oils in the skin, and enzymes break down bacteria.
4
Q
what is the purpose of non specific defence (cell-mediated immunity)
A
- neutrophils, monocytes, and macrophages all kill bacteria by engulfing them
- natural killers that target cells that have become cancerous
5
Q
what is the purpose of specific defences
A
- uses anti bodies
- lymphocytes are responsible for this immune response
6
Q
what are antibodies
A
Y-shaped proteins that are produced by the immune system to help stop and destroy intruders from harming the body
7
Q
what are antigens
A
molecules found on surface of cells and on pathogen; provide an identification system
8
Q
what does the B cell do
A
produce Y shaped antibodies
9
Q
what does the T cell do
A
- signal an attack from foreign invaders
- produced in thymus gland
