1. Review a textbook section on the thymus and spleen.
2. Locate the thymus and spleen in the anatomical chart of the lymphatic system and on the human torso.
4. Obtain a prepared microscope slide of human thymus and observe it using low-power magnification (fig. 48.3). Note how the thymus is subdivided into lobules by septa of connective tissue that contain blood vessels. Identify the capsule of loose connective tissue that surrounds the thymus, the outer cortex of a lobule that is composed of densely packed cells and is deeply stained, and the inner medulla of a lobule that is
composed of loosely packed lymphocytes and epithelial cells and is lightly stained.
5. Examine the cortex tissue of a lobule using highpower magnification. The cells of the cortex are composed of densely packed lymphocytes among some epithelial cells and macrophages. Some of these cortical cells may be undergoing mitosis, so that their chromosomes may be visible.
6. Prepare a labeled sketch of a representative section of the thymus in Part D of the laboratory report.
7. Obtain a prepared slide of the human spleen and observe it using low-power magnification
(fig. 48.4). Identify the capsule of dense connective tissue that surrounds the spleen. Note that the tissues of the spleen include circular nodules of white (in unstained tissue) pulp that are enclosed in a matrix of red pulp.
8. Examine a nodule of white pulp and red pulp using high-power magnification. The cells of the white pulp are mainly lymphocytes. Also, there may be an arteriole centrally located in the nodule. The cells of the red pulp are mostly red blood cells with many lymphocytes and macrophages.
9. Prepare a labeled sketch of a representative section of the spleen in Part D of the laboratory report.
Locate the six major areas of lymph nodes and identify the components of the lymphatic system. Search these at http:// www.mhhe.com/biosci/abio/martinlmwq.mhtml
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.