Which is a foreign substance that triggers an immune response?

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Multiple Choice

Which is a foreign substance that triggers an immune response?

Explanation:
Antigens are foreign substances that trigger an immune response. The immune system detects specific parts of an antigen, called epitopes, and mounts defenses such as antibody production and T cell activation in response. Hormones regulate body processes, enzymes speed up reactions, and antibodies are produced to bind antigens after the response has started—so they’re not what initiate the response.

Antigens are foreign substances that trigger an immune response. The immune system detects specific parts of an antigen, called epitopes, and mounts defenses such as antibody production and T cell activation in response. Hormones regulate body processes, enzymes speed up reactions, and antibodies are produced to bind antigens after the response has started—so they’re not what initiate the response.

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