Abusto_module4labworksheet_07282019.docx

Abusto_module4labworksheet_07282019.docx - Module 04 Lab...

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Module 04 Lab Worksheet: Lymphatic and Immune Systems Introduction This week’s lab will focus on understanding the concepts of the lymphatic and immune system's ability to protect and defend our body from foreign pathogens and assist in maintaining homeostasis. Objectives Objectives for this week’s lab include: 1) Compare and contrast innate and adaptive defenses, 2) Compare and contrast the various forms of adaptive defenses, and 3) Perform ELISA tests on simulated patients. Overview The lymphatic and immune systems play a vital role in our body’s ability to defend itself from pathogens- biological agents that can cause harm, illness and/or disease to its host. The immune system is technically not an organ system but rather a collection of barriers, proteins and immune cells that reside throughout the entire body but are concentrated within the lymphatic system. The lymphatic system’s primary role is to collect fluid that has leaked out of the capillary vessels, mainly plasma components, filter the fluid and return it back to the circulatory system (blood). It is composed mainly of three components: Lymphatic vessels, lymph, and lymph nodes. The lymphatic system also consists of lymphatic organs and tissues such as the spleen and thymus. Fluid that is lost from capillary blood vessels due to osmotic pressure, is “soaked” up by the permeable lymphatic vessels that found throughout the body and interweave with tissues and capillary beds. The fluid inside the lymphatic vessels is then referred to as lymph fluid, which is very similar to the composition to the plasma of blood. The lymph fluid is ultimately returned back to the circulatory bloodstream to maintain proper blood volume, but first the lymph fluid is filtered and “cleaned up”. The lymphatic vessels transport the lymph nodes, which are the primary and most numerous lymphatic organ. Lymph nodes are found all throughout the body but are concentrated in specific regions of the body, such as the axilla and neck. The lymph nodes serve two basic functions: 1. Filter the lymph fluid by removing any pathogens (particularly microorganisms) and any other cellular debris, and 2. Allow for quick activation of the immune system cells if a foreign antigen is detected.
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