An antigen is a substance either foreign or internal that triggers an immune response. This response is triggered by a histocompatibility molecule within each cell that can trigger an immune response.
Wait, I thought antigens were something that suppressed the immune system. Maybe I'm getting that mixed up with something else. I better double-check my notes before answering this.
Okay, I've got this. Antigens are the foreign substances that our immune system recognizes and responds to. So option A, "a substance that stimulates an immune response," is the correct answer.
Hmm, I'm a little unsure about this one. I know antigens have something to do with the immune system, but I can't quite remember the exact definition. I'll have to think this through carefully.
C'mon, it's obviously A. Antigens are like the supervillains of the body - they're here to cause trouble, not help with digestion or muscle movement. I bet the person who wrote this question was feeling a little 'antsy' that day.
Macy
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