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PublishCathleen Melissa Peters Modified over 8 years ago
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Fig. 7.6 THE CELL CYCLE
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CANCER Fig. 7.9
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Cell Cycle Control Cells that are not directed by the cell cycle control system tend to divide out of control This can result in a benign tumor (abnormal mass of essentially normal cells) Can cause problems depending on where they are located Always remain at the original site in the body Displaces normal tissue as it grows
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What is Cancer? Cancer cells have a have a faulty cell cycle, divide out of control and demonstrate bizarre behavior Malignant tumor – lump that results from the division of a cancer cell Can spread into nearby tissue or other parts of the body Displaces normal tissue as it grows Can spread into the circulatory system Metastasis – spread of cancer cells from origin
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Cancer cont. Cancers are named for where they originate 4 categories 1.Carcinomas – originate in the external or internal coverings of the body EX – skin or linings of the intestines 2.Sarcomas – arise in tissues that support the body EX – bone and muscle 3.Leukemia – cancer of the blood forming tissue EX – bone marrow 4.Lymphomas – cancer of the blood forming tissue EX – lymph nodes
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Cancer Treatments Radiation Therapy – Cancer cells exposed to high-energy radiation to disrupt cell division Radiation can usually destroy cancer cells without harming too many normal cells Can have bad side effects EX – sterility if near ovaries or testes Chemotherapy – Drugs that disrupt cell division are administered Antimitotic drugs – prevent cell division by interfering with spindle formation EX – taxol and vinblastine Surgery or another method to stop cells from dividing…
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