AnswersEAP-Biology B CRThe Digestive System

The Immune System Answers

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A person who has a weakened immune system may not be able to fight against infection because

A
pathogens may enter the body and cause illness.
B
phagocytes may enter the body and cause illness.
C
normal cells crowd out unhealthy cells.
D
antibodies production is increased.
2
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Which are correct examples of physical (P), chemical (C), and biological (B) barriers?

A
P: complement system; C: saliva; B: coughing
B
P: coughing; C: saliva; B: complement system
C
P: coughing; C: sneezing; B: complement system
D
P: complement system; C: saliva; B: sneezing
3

A person who has allergies has a compromised immune system because the body’s immune system

A
attacks its healthy cells.
B
overreacts to an antigen.
C
steals nutrients from healthy cells.
D
responds to mutagens.
4

What do saliva, tears, and nasal mucus have in common?

A
All can be classified as biological barriers.
B
All contain Langerhans cells.
C
All can destroy bacterial cell walls.
D
All are part of the complement system.
5

What is the difference between B-cell lymphocytes and T-cell lymphocytes?

A
B cells regulate blood pH, and T cells regulate body temperature.
B
B cells are produced in the thymus, and T cells are produced in the bone marrow.
C
B cells engulf bacteria, and T cells carry bacteria to the lymph nodes.
D
B cells produce antibodies, and T cells destroy infected cells.
6

Which is an effect of a compromised immune system?

A
decreased antibody production
B
improved ability to fight disease
C
increased lymphocyte production
D
reduction in pathogens entering the body
7

How does inflammation help the body fight off further infection?

A
Inflammation keeps harmful substances away from healthy cells.
B
Inflammation triggers the production of white blood cells.
C
Inflammation drops the pH of blood.
D
Inflammation raises the pH of blood.
8

Which type of barrier are coughing and sneezing?

A
psychological
B
chemical
C
biological
D
physical
9

Why is the action of phagocytes considered a nonspecific response?

A
It does not occur at any specific temperature.
B
It is not involved with the production of any specific type of lymphocyte.
C
It does not respond to any specific type of hormone.
D
It is not a response to a specific type of pathogen.
10

A scientist wanted to formulate a pill to attack a specific type of bacteria that infects the throat. Which biological component would be best to use as a model for the pill’s function?

A
bacteriocytes
B
phagocytes
C
complement system
D
antibodies

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The Immune System Answers — EAP-Biology B CR