Lymphatic System Lab: Microscopic Anatomy and Functions

Straighterline A&P2 - Lymphatic 12 Lab Clinical Microbiology (Western Governors University) Studocu is not sponsored or endorsed by any college or university Straighterline A&P2 - Lymphatic 12 Lab Clinical Microbiology (Western Governors University) Studocu is not sponsored or endorsed by any college or university Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

Lab 12 The Lymphatic System BIO202L Student Name: Access Code (located on the lid of your lab kit): Pre-Lab Questions: ” 1. In what areas are lymph nodes clustered? Why is this desirable? ” Lymph nodes are clustered near the groin area and around the neck area. These are perfect locations for lymph nodes because the orifices of the body are concentrated in the head area so the neck lymph nodes are close to the head to protect the body against any foreign invaders that may come through the eyes, ears, nose, or mouth. And the groin lymph nodes are in the ideal location to ward off any invaders that may enter through the urinary, genital, or anus areas. ” 2. Explain how the flow of lymph is controlled through lymphatic vessels. ” There are one-way valves that ensure that lymph is flowing towards the heart. Lymph flows from lymphatic capillaries to lymphatic vessels and then lymph flows through lymphatic ducts into the circulatory system. Experiment 1: Examining the Microscopic Anatomy of Lymphatic System Post-Lab Questions ” 1. Label the items in the following slide pictures based on your observations. ” A- Lymphoid Follicle B- Germinal center C- Connective tissue capsule D- Medulla E- Red Pulp F- White Pulp Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

Lab 12 The Lymphatic System BIO202L Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

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Lab 12 The Lymphatic System BIO202L ” 2. Are there more afferent or efferent vessels attached to a lymph node? What is the functional purpose of this? ” There are more afferent vessels than efferent vessels attached to a lymph node. This is to slow the lymph down so it allows time for the cleaning process. ” 3. What structural similarities did you observe between the lymph node and spleen? ” At the 1000x microscopic level, lymph nodes and the spleen look very similar. At this level the immune cells can be seen in both such as the T cells, B cells, and lymphocytes. Experiment 2: The Virtual Model – The Lymphatic System Insert screenshot of the spleen: Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

Lab 12 The Lymphatic System BIO202L Insert screenshot of the thoracic duct: Insert screenshot of the axillar lymph node: Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

Lab 12 The Lymphatic System BIO202L Post-Lab Questions ” 1. Is the cisterna chyli or the spleen more medial to the spinal cord? ” The cisterna chyli is more medial to the spinal cord then the spleen. ” 2. What is the name of the most superior lymph nodes in the head region? ” The most superior lymph node in the head region is the preauricular lymph nodes. ” 3. Where are the popliteal nodes located? ” The popliteal lymph nodes are located behind the knees. ” 4. What are the most inferior lymph nodes in the body called? ” The most inferior lymph nodes are called the popliteal lymph nodes. ” 5. What component of the lymphatic system filters lymph from the upper limbs and upper external part of the thorax? The right lymphatic duct, the subclavian trunk, and the thoracic duct drains lymph from the upper limbs and upper external part of the thorax. Experiment 3: Fetal Pig Dissection: The Lymphatic System ” Insert photo of your pig’s exposed spleen with your name and access code handwritten clearly in the background: “ Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

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Lab 12 The Lymphatic System BIO202L Post-Lab Questions 1. What observations did you make regarding the lymphatic system of the fetal pig? The observations I made regarding the lymphatic system in the fetal pig are that the lymphatic system is much harder to locate in the body then some of the other systems. The organs such as the spleen and the thymus were easier to locate then the lymphatic vessels and lymph nodes. 2. Compare and contrast the vessels of the lymphatic system and the circulatory system. Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

Lab 12 The Lymphatic System BIO202L There are several differences between the lymphatic and circulatory systems. One difference is that the circulatory system has a pump, the heart, which pushes blood throughout the body. The lymphatic system does not have this, it relies on contraction of skeletal muscle, contraction of lymphatic vessels, and thoracic pressure to move lymph. A similarity between the two systems is that they both have one-way valves in which blood or fluid moves to prevent backflow. Both systems take part in the immunity system to keep the body defended against bacteria and viruses; they both contain WBC but only the circulatory system contains RBC. Downloaded by shade mobley (smobley18@capellauniversity.edu) lOMoARcPSD|23679171

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