Defence mechanism

Question 1

What is immunity

What is a antigen

Answer 1

Immunity-body protect from pathogens. Antigen - protein triggers immune system found on surface of cell

Question 2

Example of immediate defence

Example of slow defence

Answer 2

physical barrier/phagocytosis.
Lymphocytes T mediated/B humoral. Lymphocytes distinguish own and foreign cell, as each cell has molecule on surface specific due to tertiary structure. 10 millions of them one have complimentary protein on surface to pathogen cause lymphocytes divide build number - clonal selection.

Question 3

Process of Phagocytosis

Answer 3

Phagocyte identify foreign antigen on pathogen so moves closer along gradient attaches to pathogen chemical. Phagocyte engulf it forming phagosome. lysosome fuse with vacuole enzyme lysozymes hydrolyses bacteria

Question 4

Lymphocytes are -
B -
T-

Answer 4

Slower but long term immunity. B- bone marrow , humoral with antibodies. T- thymus gland , cell mediated response.