11. Immunity and Lymphatic system

Question 1

4 types of foreign agents

Answer 1

bacteria
fungi
protozoa
parasite

Question 2

what is a non-self antigen?

Answer 2

Antigen receptors on T cells and B cells recognise these foreign proteins as not being “Self”, as ‘foreign’ aims to remove them from the body

Question 3

5 features of the innate immune system

Answer 3

physical barriers
chemical mediators
WBC
inflammation
fever

Question 4

4 examples of chemical mediators

Answer 4

histamines
cytokines
compliment proteins
interferons

Question 5

3 features of adaptive immunity

Answer 5

specificity
memory
acquired

Question 6

what eliminated antigens?

Answer 6

cytotoxic T cells

Question 7

what is a memory cell?

Answer 7

A cell created in the specific immune response, so that if the same antigen re-appears, the response will be faster

Question 8

what do B cells divide into?

Answer 8

plasma cells which make antibodies

Question 9

3 effects of antibodies

Answer 9

inactivate an antigen
bind antigens together
facilitate phagocytosis

Question 10

what is the normal amount of helpert T cells?

Answer 10

1200 cells/mm3

Question 11

3 functions of the lymphatic system

Answer 11

fluid balance
fat absorption
defence

Question 12

what does the epithelium in lymphatic capillaries function as?

Answer 12

a series of one-way valves

Question 13

function of lymphatic ducts

Answer 13

drain tissues of body and move lymph into major veins

Question 14

4 spleen functions

Answer 14

• Monitor blood, detects and responds to foreign antigens
  
  • Destroy defective RBC
  • Regulates blood volume
  • Limited reserve of RBC

Question 15

function of thymus

Answer 15

Site of maturation of T cells: many T cells produced here, but most degenerate