June science exam Flashcards
1
Q
What does the immune system do?
A
it defends the body against infection while protecting the body’s own cells
2
Q
What do white blood cells do?
A
they move through the bloodstream and into tissues, looking for signs of infection or tissue damage
3
Q
What are pathogens?
A
harmful organisms or substances foreign to the body that can cause disease
4
Q
What are antigens?
A
substances on the surface of pathogens
5
Q
What are the two main groups of leukocytes?
A
phagocytes and
lymphocytes
6
Q
What are leukocytes?
A
White blood cells
7
Q
What do phagocytes do?
A
they absorb invading bacteria
8
Q
A
