Ch 27: Antigens & Immune Response

About This Chapter

Check out this chapter to find out about antigens and immune responses. We offer a full range of learning materials, including self-assessment quizzes that you can use to measure your knowledge of these biology topics, which can help you be better prepared for upcoming exams.

Antigens & Immune Response - Chapter Summary

Delve into this chapter as you study about antigens and immune responses. These lessons elaborate on how the body becomes sick and what steps your body takes to counteract illnesses. As you move through the chapter, you will discover more about different levels of immune responses, germs, and how our bodies manage to stay healthy.

While learning about the immune responses of the body, the instructors show you examples of how many ways our bodies can react to protect us. You'll even get to review some of the backup systems used in case anything gets past our regular immune responses. At the end of this chapter, you will be able to do the following:

  • Differentiate pathogens from antigens
  • Describe allergens, self-antigens, and non-self-antigens
  • Identify components of the immune system and immune responses
  • Define major terms about the cellular level of the immune system
  • Explain the function of neutrophils
  • Elaborate on the steps of the inflammatory response
  • Point out the immune response of the lymphatic system
  • Show the features of the humoral immune response
  • Outline the features and steps of the cell-mediated immune response

Concerning the video lessons offered throughout several of our chapters, you will be happy to know that every video lesson comes with a lesson transcript. The transcripts provide a typed-out version of what's discussed in the videos. Some of our users enjoy reading through the transcripts after viewing the video lessons, because it helps them memorize key information.

9 Lessons in Chapter 27: Antigens & Immune Response
Test your knowledge with a 30-question chapter practice test
Antigens vs. Pathogens

1. Antigens vs. Pathogens

Pathogens are small agents that can make you sick. Antigens are a part of the pathogen that your body recognizes. This lesson discusses how they differ and how your body protects against them.

Non-Self Antigens, Self-Antigens & Allergens

2. Non-Self Antigens, Self-Antigens & Allergens

Your immune system uses antigens to identify which cells belong to you and which should be destroyed. In this lesson, learn about nonself-antigens, self-antigens, and allergens, and how your immune system responds to them.

Immune System & Immune Response

3. Immune System & Immune Response

Your immune system protects you from foreign invaders that might harm you. When your immune system responds to these threats, it's called an immune response. Learn about two arms of immunity known as antibody-mediated and cell-mediated immunity.

The Immune System at the Cellular Level: Terminology

4. The Immune System at the Cellular Level: Terminology

This lesson defines several terms related to the microscopic aspects of the immune system: immunity, lymphocytes, B cells, T cells, macrophages, dendritic cells, complements, interferon, and lymphokines.

Neutrophils: Definition & Function

5. Neutrophils: Definition & Function

Even though there are germs all around us all the time, we rarely get sick. That's because our immune system is constantly on guard, protecting us from infections. In this lesson, learn about neutrophils, the first responders of the immune system.

The Inflammatory Response: Definition & Steps

6. The Inflammatory Response: Definition & Steps

The inflammatory response is a part of your innate immune system that responds to infection and injury. In this video, you'll learn about the process of inflammation and what happens when it becomes chronic.

The Lymphatic System & Immune Response

7. The Lymphatic System & Immune Response

How does your body stay healthy when there are so many germs attacking it? Learn more about the lymphatic system that helps circulate immune cells that protect you from disease.

The Humoral Immune Response: Definition and Features

8. The Humoral Immune Response: Definition and Features

This lesson will describe what humoral immunity is, how it is activated, what is produced, and why. Find out as we explore antigen presenting cells, MHC, T cells, B cells, plasma cells, and antibodies.

Cell-Mediated Immune Response: Definition, Steps & Features

9. Cell-Mediated Immune Response: Definition, Steps & Features

Our immune systems are pretty good, but sometimes pathogens can sneak in and infect living cells. Luckily, we've got a back up system. Let's explore cell-mediated response and see how this protects our bodies from infections that may otherwise go untreated.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.