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Biol 411 - Exam III - 1 The removal and destruction of old...

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1. The removal and destruction of old erythrocytes is done mostly by macrophages in the spleen (red pulp). 2. The predominant form of antibody secreted across mucosal surfaces is IgA (digestive tract). 3. The following statements are true: a. Thee space indicated by “A” is the subcapsular sinus and receives lymph from afferent lymphatic vessels b. The area indicated by “B” is a diffuse lymphoid tissue rich in T cells and antigen presenting cells c. The structures labeled “C” are lymphoid nodules rich in B cells 4. Of the tissues and organs we have studied, spleen and bone marrow contain sinusoidal capillaries. 5. The earliest morphologically distinguishable cell of a particular hematopoietic lineage is a precursor cell. 6. Mechanisms by which antibodies inactivates or eliminate antigens include: a. agglutination, b. opsinization, c. recruitment of cytotoxic cells, and d. neutralization by physically binding and blocking the antigens 7. The following is true of small intestine enterocytes: a. Their apical surface is covered with microvilli, increasing the surface area, b. These are short lived cells and must be constantly replenished from stem cells near the base of the glands c. Final steps in digestion of carbohydrates and proteins are catalyzed by enzymes integrated into their apical membranes 8. Consider the layers of tissue that make up the wall of the upper quarter of esophagus. Starting in the lumen, the order of these layers is (lumen) – stratified squamous epithelium – lamina propia – muscularis mucosa – (smooth muscle) – submucosa – muscularis (skeletal muscle) – adventitia
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9. The thymic-blood barrier is important in preventing foreign antigens that may be present in the blood from entering the thymus. Structurally, this barrier if formed by epithelial reticular cells and continuous capillaries.
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