A nurse in a well-child clinic is teaching parents about their child's immune system. Which statement by the nurse is correct?
a. The immune system distinguishes and actively protects the body's own cells from
foreign substances.
b. The immune system is fully developed by 1 year of age.
c. The immune system protects the child against communicable diseases in the first
6 years of life.
d. The immune system responds to an offending agent by producing antigens.
A
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A The immune system responds to foreign substances, or antigens, by producing
antibodies and storing information. Intact skin, mucous membranes, and
processes such as coughing, sneezing, and tearing help maintain internal
homeostasis.
B Children up to age 6 or 7 years have limited antibodies against common bacteria.
The immunoglobulins reach adult levels at different ages.
C Immunization is the basis from which the immune system activates protection
against some communicable diseases.
D Antibodies are produced by the immune system against invading agents, or
antigens.
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