The student nurse studying the immune system is aware that normal immunity is based on the body's ability to recognize foreign proteins and to marshal its defenses to destroy foreign matter
Which of the following statements accurately describes a function of the immune system? A) When an antigen enters the body, the body responds by producing antibodies.
B) The antigen–antibody reaction releases chemical mediators known as allergies.
C) An allergic reaction may occur at the first exposure to an antigen.
D) Normally, the body is not able to distinguish "self" from "not self."
A
Feedback:
When an antigen (a foreign protein substance) touches or enters the body, the body reacts by producing antibodies, also known as immunoglobulins, for protection against that antigen. The antigen–antibody reaction releases chemical mediators, the most common being histamine. These mediators initiate a series of physiologic events in the body's organs. Because antibodies form after initial contact with an antigen, an allergic reaction cannot occur at the first exposure to an antigen. Normally, the body is able to distinguish "self" from "not self" and takes steps to eliminate substances in the "not self" category.
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