BIO-202 Unit 4 Lab Report Purpose: What was the purpose of doing this exercise? Activity 1: Microscopic Anatomy of Lymphatic Structures Observations: Sketch of Reticular Connective Tissue Slide (Lymph Node). Describe the structures you observed on the slide Sketch of Spleen Slide: Describe the structures you observed on the slide Sketch of Tonsil Slide: Describe the structures you observed on the slide Sketch of Thymus Slide: Describe the structures you observed on the slide

Questions: A. How are lymph, lymphatic vessels and lymph nodes related? B. What are the two major functions of the lymph nodes? C. What are the two functions of the spleen? D. What is the function of the tonsils? E. What are the structural similarities found in lymph nodes, spleen and tonsils? Activity 2: Immunity and the Immune Response Observations: Describe what happened to the red and green food coloring after 45 minutes: Which sera was an antigen in section 2 of the dish?

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Describe what you observed in section 2 of the dish. Which sera was the antigen in the “unknown” sample used in section 3 of the dish? Describe what you observed in section 3 of the dish. Questions: A. Explain what is meant by “memory” as a characteristic of the immune response. B. How does our immune response distinguish between our own cells and foreign invaders? C. What are lymphocytes and where are they produced? D. Distinguish between an antigen and an antibody. E. Why is the term “immune system” a misnomer?

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