Immune System and Blood Platelets A.

Topics: Immune system, Antibody, Bacteria Pages: 3 (539 words) Published: September 18, 2014
Cert_Bio II - Body Defence

39.Which of the following are concerned with the prevention of bacterial infections in different parts of the human body?

Alimentary canal
Respiratory tract
digestive enzymes
white blood cells
red blood cells
blood platelets
bile salts
white blood cells

Directions: Questions 48 and 49 refer to the graph below which shows the changes in the concentration of antibodies in the blood of a person with time:

48.The increase in the antibody concentration on day 7 might be caused by A. excessive bleeding
B. the entry of bacteria
C. recovery from a disease
D. the intake of a large amount of antibiotics

49.The antibody concentration increased rapidly on day 21 because the person A. developed a fever.
B. received a vaccination.
C. was infected by the same type of antigen.
D. produced a large number of phagocytes.

32.Which of the following components of the blood can destroy bacteria that have entered the body? (1) antibodies
(2) phagocytes
(3) blood platelets

A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)

46.Which of the following are examples of artificial immunity? (1) Injection of vaccine into the body
(2) Injection of antibodies into the body
(3) Injection of antibiotics into the body

A. (1) only
B. (1) and (2) only
C. (2) and (3) only
D. (1), (2) and (3)

34.In the alimentary canal, bacteria in food are mainly killed by A. saliva.
B. mucus.
C. gastric juice
D. pancreatic juice

Directions:Questions 49 and 50 refer to the graphs below, which show the changes in the antibody level in the blood as a result of two methods of inducing immunity in humans:

49.Substance P can be
(1) bacteria.
(2) antigens.
(3) antibodies.

A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only

50.What is the advantage of method 2 over method 1 in inducing...
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