Gr 7 Science Ch 3.2 (Urinary & Lymphatic Systems)
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| excretory system | body system that excretes wastes from the body
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| urinary system | portion of the excretory system that removes liquid and soluble waste products from the body
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| kidneys | bean-shaped organ that filters waste products and excess water from the blood
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| ureters | either of the tubes that connect the kidneys to the bladder
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| bladder | organ where urine is stored
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| urethra | canal that discharges urine from the body
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| lymphatic system | portion of the immune system that circulates tissue fluid
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| tissue fluid | liquid that surrounds every cell in the body
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| lymph | tissue fluid that has been forced into lymph vessels
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| lymph nodes | enlarged bundles of lymphatic tissue that cleans lymph of debris and microorganisms
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| Peyer's patches | groups of lymph nodes in the ileum of the small intestine which continuously clean and protect your digestive system so that it can work efficiently
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| spleen | largest lymphatic organ; filters dead cells and microbes in the blood; serves as a storage tank for blood
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| immune system | body system that fights pathogens
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| lysozyme | antibacterial enzyme contained in tears and perspirations
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| skin | prevents many harmful microorganisms from entering your body
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| mucous membranes | line body passageways that open to the outside and use mucus to trap invaders
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| stomach's hydrochloric acid | destroys most harmful bacteria that enter your digestive system with your food
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| white blood cells | phagocytes
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| lymphocytes | groups of white blood cells that includes B cells, helper T cells, and killer T cells
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| antibodies | substances produced by the body to inactivate pathogens so they cannot do any damage before they are destroyed
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| immunity | ability of the body to resist invasion by a pathogen
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| thymus | organ that is located behind the breastbone and between the lungs and plays an important role in the development of lymphocytes
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| adenoids | accumulation of lymphatic tissue that prevents pathogens from entering the body through the throat
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| tonsil | accumulation of lymphatic tissue in the throat
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| acquired immunity | resistance to disease caused by being exposed to a pathogen, receiving a vaccine, or receiving an injection of antibodies
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| innate immunity | the body's natural resistance to disease in general or to specific diseases (without having been exposed to the pathogen or a vaccine)
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