phagocytosis

Question 1

what is phagocytosis?

Answer 1

the cellular response of engulfing solid particles by the cell membrane to form an internal phagosome by phagocytes

Question 2

what is phagocytosis used for?

Answer 2

a specific second line of defence against invading pathogens

Question 3

what is stage 1 of phagocytosis?

Answer 3

a phagocyte recognises the foreign invader/ antigens on a pathogen

Question 4

what is stage 2 of phagocytosis?

Answer 4

the cytoplasm of the phagocyte moves around the pathogen, engulfing it ENDOCYTOSIS

Question 5

what is stage 3 of phagocytosis?

Answer 5

the pathogen is now contained in a phagocytic vacuole/ phagosome in the cytoplasm of the phagocyte

Question 6

what is stage 4 of phagocytosis?

Answer 6

a lysosome fuses with the phagocytotic vacuole and the lysozymes in the lysosome break down the pathogen

Question 7

what is stage 5 of phagocytosis?

Answer 7

the phagocyte presents the pathogens antigens on its surface to activate other immune system cells. The phagocyte is now an antigen presenting cell

Question 8

what are phagocytes?

Answer 8

white blood cells produced in the bone marrow

Question 9

what are phagocytes responsible for?

Answer 9

removing dead cells and invasive microorganisms

Question 10

what type of immune response do phagocytes carry out?

Answer 10

non specific

Question 11

what are the 2 types of phagocytes?

Answer 11

neutrophils, macrophages