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Delve into how the lymphatic system safeguards our body by eliminating pathogens. Explore the roles of lymph, lymph nodes, spleen, and more in combating infections, supported by mechanical and chemical barriers.
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Lymphatic SystemEQ: How does the lymphatic system destroy pathogens that enter our body?
Pathogens • Any foreign molecules that enter the body: Particles, viruses, bacteria, pollen, etc.
Lymphatic System • Part of the immune system and helps destroy pathogens that enter the body • Works with circulatory system, moving white blood cells around
Uses fluid from digestive and circulatory system to filter out dead cells, viruses, bacteria. • After filtering, it returns the fluid
Lymphatic Pathway • System of capillaries and tubes that run through the body and filter bodily fluids
Lymph • Fluid, similar to plasma, that runs through the lymphatic pathways, filtering and transporting
Lymph nodes trap and remove pathogens from the lymph as it flows through. • Similar to a check point • Lymph nodes store Leukocytes to destroy pathogens
When you have an infection, your body produces more white blood cells, which gather in the lymph nodes • This causes lymph nodes to swell.
Lymphocytes • Specific white blood cells that destroy pathogens in the lymphatic system
Spleen • Organ that recycles old red blood cells and produces lymphocytes • Also stores blood and platelets.
Tonsils • Cluster of lymph tissue in your throat that protects against pathogens that enter your nose and mouth. • Your body can function without tonsils
Mechanical Barriers • Skin, mucous membranes in organs, hair provide first line of defense.
Chemical Barriers • Enzymes, gastric juice, leukocytes, lymphocytes act as second defense after mechanical barriers fail
Inflammation • Tissue response to injury or infection. • Infected cells release chemical that attract leukocytes to phagocytize pathogens. • Result is damaged cells, destroyed bacteria called pus
LEFT SIDE ACTIVITY • Draw a body which shows the lymphatic system • Label all of the organs of the lymphatic system and the location of the lymph nodes.