unit d - immune sytem

Question 1

what is a pathogen ?

Answer 1

anything that can make you sick.

eg ; fungi, parasites, bacertia or viruses.

Question 2

what are the four things in the first line of defense ?

Answer 2

1. skin
2. mucuos membranes
3. secretions
4. hairs and cilia

Question 3

what two things make up the second line of defence ?

Answer 3

1. macrophages

2. phagocytosis

Question 4

what are macrophages ?

Answer 4

white blood cells that recognize forgein materials in the body. Their goal is to eliminate them.

Question 5

what is phagocytosis ?

Answer 5

process of recognizing something that shouldn’t be there, engulfs it and eats it.