5.2 phagocytosis

Question 1

what are the two main types of white blood cells?

Answer 1

phagocytes & lymphocytes

Question 2

what type of response occurs & what do phagocytes do?

Answer 2

non-specific, ingest & destroy pathogens by phagocytosis

Question 3

what type of reaction occurs & what do lymphocytes do?

Answer 3

specific, immune response

Question 4

explain the process of phagocytosis. (5)

Answer 4

1- chemotaxis - chemicals released by pathogens attract the phagocyte & moves toward it along a concentration gradient
2- complementary receptors bind to surface of pathogen
3- cell surface membrane engulfs & traps pathogen (endocytosis) -> forms phagosome
4- lysosomes fuse with phagosome & releases lysozymes which hydrolyses & destroys bacterium
5- hydrolysis products are absorbed by phagocyte