A nurse in a well-child clinic is teaching parents about their child's immune system. Which statement, made 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
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. Children up to the age of 6 or 7 years have limited antibodies against common bacteria. The immunoglobins reach adult levels at different ages. Immunization is the basis from which the immune system activates protection against some communicable diseases. Antibodies are produced by the immune system against invading agents, or antigens.
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