Arkansas Esthetician Practice Exam

Antigens stimulate the immune system to respond and work towards neutralizing potential threats to the body. Antigens are often found on foreign substances such as viruses or bacteria, and when they enter the body, they trigger the immune response to protect against infection or illness. The other options, production of melanin, growth of hair, and formation of blisters, are all unrelated to antigens and do not provoke an immune response. Melanin is responsible for skin and hair color, while hair growth is controlled by different factors such as genetics and hormones. Blisters are commonly the result of skin irritation or injury, not antigens. Therefore, option A is the most accurate and relevant answer.