Antigen:
1. Antigens, large protein molecules found on pathogens such as bacteria, fungi, and viruses, trigger immune responses in the body.
2. Upon entry into the body, harmful agents like the common cold virus prompt the production of antibodies as a defense mechanism.
3. The immune reaction involves the assembly of antibodies, which work to prevent the individual from falling ill.
4. In summary, when pathogens enter the body, antigens stimulate the immune system to produce antibodies, offering protection against potential sickness.
Antibody:
1. Antibodies, also called immunoglobulins (Ig), are large Y-shaped blood proteins produced by plasma cells.
2. They effectively bind to foreign particles and neutralize their invasion within the body.
3. Antigens, foreign pathogens, can stimulate the immune system by binding with antibodies, leading to a specific immune reaction.
4. This immune response involves the production of antibodies by the system to counteract the presence of antigens.