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name 4 types of virus
covid 19
ebola
HIV
influenza
how do you calculate bmi?
mass/height squared
name 2 examples of STIs
gonorrhea
chlamydia
what do white blood cells do?
combat pathogens if they enter the body
where are antibodies found?
on lymphocytes
where are antigens found?
on pathogens
the immune response
pathogens have a unique antigen on their surface that corresponds to the antibody of the lymphocytes
the antigen binds to its corresponding antibody on the lymphocyte, activating the lymphocyte
the lymphocyte then divides over and over again to produce clones
other lymphocytes remain in the blood as memory lymphocytes, ready to respond immediately if the same pathogen returns
how do vaccines work?
person is injected with a weakened or dead version of the microbe
white blood cells produce antibodies to fight off the microbe
the microbe will be destroyed quickly so the person doesn’t become unwell
if they get infected in the future, the body will recognise the microbe and antibodies are produced quicker