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Ch. 21 The Immune System: Innate and Adaptive Body Defenses

Chapter 20, Problem 19

How do antibodies help defend the body?

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Hello, everyone and welcome to today's video. So which of the following molecules binds with an antigen or with the antigens and play a crucial role in facilitating the Figo cytosis of pathogens. As answer choice. A we have anti tos B, anti anti totes C antibodies D antibiotics. Now let's go over each of these answer choices so that we can select the correct one. First, let's look at a which is anti toss. These anti tos refers to molecules that neutralize toxins produced by the pathogens. But did they do not directly participate in the cytosis of these pathogens that rather neutralize the toxins released by them? Therefore, we can cancel this out. Then we have B which is anti totes. This is going to be a made up term and it is not related to the immune response in our body. So we can cancel it out. Then we have D which is antibiotics, which are going to be certain molecules that can inhibit or kill bacteria. However, they're not going to be doing it by P Figo cytosis or marking them by Figo cytosis. They're going to target specific bacterial mechanisms such as the bacterial cell wall and degrade it so that the bacteria can be killed and we can protect our bodies. But since they do not mark them for Figo cytosis, we can cancel this out. Finally, we have C which is antibodies and this is going to be a very popular term because antibodies are produced within our bodies and they're going to be acting like markers. So when these antibodies find antigens that are complementary to them, they combine to the antigens which are going to be parts or going to be coming from these pathogens or these four A substances. And by binding to these antigens, they can mark them for Figo cytosis so that the body can degrade them. This is how antibodies is, are going to work. This is their mechanism of action and it is exactly what the question is describing. So we're going to be able to highlight answer choice c antibodies as the final answer to our question. I really hope this video helped you and I hope to see you on the next one.