A patient asks the nurse how the immune system protects the body. What is the nurse's best response?
1. "Self-recognition allows the immune system to recognize foreign parts."
2. "Memory means that the immune system develops lasting protection against specific invaders."
3. "Specificity is the ability of the immune system to react with a particular response to one antigen."
4. "Tolerance is the term for the ability of the immune system to differentiate between the person's body and foreign substances."
2. "Memory means that the immune system develops lasting protection against specific invaders."
Explanation: 1. Self-recognition or tolerance is the ability of the immune system to differentiate between substances that are part of the person's body and those that are foreign.
2. Memory means that the immune system has the capacity to develop long-lasting protection against specific invaders. A residual set of cells that are specific to each antigen remains in the body, to be stimulated when the antigen presents itself at a later time. Each successive time the antigen is encountered, a quicker and more intense reaction is stimulated by the immune system in the healthy older person.
3. Specificity refers to the ability of the immune system to react with a particular immune response to one antigen. Each new antigen stimulates a different immune response.
4. Tolerance is another term for self-recognition and is the ability of the immune system to differentiate between substances that are part of the person's body and those that are foreign.
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