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Gr 7 Science Ch 3
Gr 7 Science Ch 3.2 (Urinary & Lymphatic Systems)
Term | Definition |
---|---|
excretory system | body system that excretes wastes from the body |
urinary system | portion of the excretory system that removes liquid and soluble waste products from the body |
kidneys | bean-shaped organ that filters waste products and excess water from the blood |
ureters | either of the tubes that connect the kidneys to the bladder |
bladder | organ where urine is stored |
urethra | canal that discharges urine from the body |
lymphatic system | portion of the immune system that circulates tissue fluid |
tissue fluid | liquid that surrounds every cell in the body |
lymph | tissue fluid that has been forced into lymph vessels |
lymph nodes | enlarged bundles of lymphatic tissue that cleans lymph of debris and microorganisms |
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 |
spleen | largest lymphatic organ; filters dead cells and microbes in the blood; serves as a storage tank for blood |
immune system | body system that fights pathogens |
lysozyme | antibacterial enzyme contained in tears and perspirations |
skin | prevents many harmful microorganisms from entering your body |
mucous membranes | line body passageways that open to the outside and use mucus to trap invaders |
stomach's hydrochloric acid | destroys most harmful bacteria that enter your digestive system with your food |
white blood cells | phagocytes |
lymphocytes | groups of white blood cells that includes B cells, helper T cells, and killer T cells |
antibodies | substances produced by the body to inactivate pathogens so they cannot do any damage before they are destroyed |
immunity | ability of the body to resist invasion by a pathogen |
thymus | organ that is located behind the breastbone and between the lungs and plays an important role in the development of lymphocytes |
adenoids | accumulation of lymphatic tissue that prevents pathogens from entering the body through the throat |
tonsil | accumulation of lymphatic tissue in the throat |
acquired immunity | resistance to disease caused by being exposed to a pathogen, receiving a vaccine, or receiving an injection of antibodies |
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) |