5.2 Phagocytosis

Question 1

What are the two type of white blood cells

Answer 1

.Phagocytes
. Lymphocytes

Question 2

What is the role of phagocytes

Answer 2

. To ingest and destroy the pathogen before it can cause harm

They provide an important defence against pathogens that manage to enter the body

Question 3

Describe step 1 of phagocytosis

Answer 3

. The phagocyte is attracted to the pathogen by chemical products of the pathogen.
It moves towards it along a concentration gradient

Question 4

Describe step 2 of phagocytosis

Answer 4

The phagocyte has several receptors on its cell surface membrane that attach to chemicals on the surface of the pathogen

Question 5

Describe step 3 of phagocytosis

Answer 5

. The phagocyte engulfs the pathogen to form a vesicle called a phagosome

Lysosomes within the phagocyte migrate towards the phagosome

Question 6

Describe step 5 of phagocytosis

Answer 6

. The lysosomes contain enzymes called lysozymes, and they release these enzymes into the phagosome which destroy the ingested bacteria/pathogen by hydrolysis of their cell walls

Question 7

What is step 6 of phagocytosis

Answer 7

The soluble products from the breakdown of the pathogen are absorbed into the cytoplasm of the phagocyte