Immune System

The Cell Defenders

Maryland Science Content Standard

• Select several body systems and explain the role of cells, tissues and organs that effectively carry out a vital function for the organism, such as defense

Objective

• Title:Homeland Security

• Date: 04/19/23

• I will explain how the immune system responds to pathogens.

Lesson Question:

What role does the immune system have in helping your body maintain homeostasis?

Engage your thinking…

Questions:

• How many kinds of invaders can each defender cell recognize?

• What happens if the defender cell is killed?

Let’s Explore the Skin!

We already know that your immune system helps to defend your body against pathogens, but how does this process work? Use the website above and your books (Chapter 5) to answer the following:

1. What immune the response?2. Explain the two things that T cells do to defend against pathogens.3. How do B cells ruin a virus?4. What is the function of an antibody?

http://www.kidshealth.org/parent/general/body_basics/immune.html

Structure and Function Structure and Function of the Immune Systemof the Immune System

• The main function of the immune system is to The main function of the immune system is to fight disease using the immune response. fight disease using the immune response.

• The cells of the immune system can The cells of the immune system can distinguish between different kinds of distinguish between different kinds of pathogens.pathogens.

• The immune system cells react to each kind of The immune system cells react to each kind of pathogen with a defense targeted specifically pathogen with a defense targeted specifically for that pathogen.for that pathogen.

• White blood cells (connective tissue) called White blood cells (connective tissue) called lymphocytes (specialized cells) come in two lymphocytes (specialized cells) come in two varieties…B cells and T cells.varieties…B cells and T cells.

Explain:Explain:B Cells and T CellsB Cells and T Cells

Use your text Use your text (Chapter 5) to (Chapter 5) to complete the Venn diagram complete the Venn diagram to compare/contrast the jobs to compare/contrast the jobs of B cells and T cells in the of B cells and T cells in the immune response.immune response.

Explain…Explain…The HIV Virus…The HIV Virus…

Use your text (Chapter 5) to answer the following:

1. How does the HIV virus affect the immune system?

2. How long might it take for someone to get sick from the HIV virus?

3. Why are people with AIDS able to live much longer now than in the past?

Evaluate yourself…

How does the immune system respond to a How does the immune system respond to a virus to maintain homeostasis in the body? virus to maintain homeostasis in the body? Please explain using information from your Please explain using information from your text and our class investigations.text and our class investigations.

Evaluate yourself…

Can you:Can you:

• Explain how the immune system responds Explain how the immune system responds to pathogens.to pathogens.