• The immune system plays an important role in keeping us healthy.
  
  
• The immune system consists of a network of organs, tissues, and cells.
  
  
• The lymphoid organs (red bone marrow, spleen, thymus, lymph nodes, and tonsils) play critical roles in defense mechanisms.

1. Which organs are primary lymphoid organs; secondary lymphoid organs?
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2. How do the primary and secondary lymphoid organs function in immunity?
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Art Labeling Activity

• The Lymphoid Organs (33.0K)
• Thymus Gland (38.0K)
• Lymph Node (39.0K)
• Spleen (37.0K)
• Bone Marrow (37.0K)

• Immunity consists of nonspecific and specific defenses to protect the body against disease.
  
  
• Nonspecific defenses consist of barriers to entry, the inflammatory reaction, natural killer cells, and protective proteins.

1. How does nonspecific defense differ from specific defense?
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2. What are some examples of the body's nonspecific defenses?
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Essential Study Partner

• Defense Mechanism Overview
• Nonspecific Immunity

Animation Activity

• Phagocytic Cells

• Specific defenses require two types of lymphocytes: B lymphocytes and T lymphocytes.

1. Which blood cells are mainly responsible for specific defense and how do they function?
   Answer

Essential Study Partner

• Specific Immunity

Animation Activity

• Clonal Selection
• T-cell Function

• Induced immunity for medical purposes involves the use of vaccines to achieve long-lasting (active) immunity and the use of antibodies to provide temporary (passive) immunity.

1. What is induced immunity? What are the different types of induced immunity, and what are some examples of each?
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Essential Study Partner

• Overview

Animation Activity

• Vaccination

• While immunity preserves life, it is also responsible for certain undesirable effects, such as allergies, autoimmune diseases, and tissue rejection.
  
  
• The lymphatic system works with the other systems of the body to maintain homeostasis.

1. What types of complications and disorders are associated with the functioning of the immune system?
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Essential Study Partner

• Abnormalities

Art Quiz

• Allergies

Systems Scramble
Systems Review Quiz