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Do Now 2/6 WOD: LANGUID (LANG gwid) adj.

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Presentation on theme: "Do Now 2/6 WOD: LANGUID (LANG gwid) adj."— Presentation transcript:

1 Do Now 2/6 WOD: LANGUID (LANG gwid) adj.
HIGH SCHOOL 7:30 AM 8:35 AM Period 1 or 2 8:40 AM 9:45 AM Period 3 or 4 9:50 AM 10:55 AM Period 5 or 6 11:00 AM 12:00 PM Period 7 or 8 12:00 PM 12:30 PM High School Lunch WOD: LANGUID (LANG gwid) adj. lacking energy; weak; showing little interest in anything

2 Chapter 5.2: Cancer INB Pg 37

3 Cancer Results from uncontrolled mitosis and cell division
Cells divide repeatedly and a tumor develops Developed countries: 1 in 4 deaths more than 200 different forms

4 Mutations Cancer starts when mutations occur in the genes that control cell division. Takes many mutations (not just 1) to cause cancer Mutated gene called oncogene Genes mutate regularly, but most mutations are either destroyed by our immune systems or do note survive to undergo mitosis

5 Mutations Cancer cells escape are not killed by immune system and survive to reproduce identical daughter cells By detection, a tumor can contain ~1 billion cancerous cells

6 Carcinogens A factor which brings about any mutation is called a mutagen, and is described as mutagenic Any agent that causes cancer is called a carcinogen, and is described as carcinogenic Some mutagens are carcinogenic

7 Carcinogens Ionizing radiation and UV light
X-rays, gamma rays, radioactive decay, sunlight Cause formation of damaging ions in cells which can break DNA strands (w/ exception of sunlight)

8 Carcinogens Chemicals Tobacco smoke, aniline dyes, asbestos, dioxins
Act by damaging DNA molecules

9 Carcinogens Virus infection
Ex: Burkitt’s lymphoma, papilloma viruses (HPV) Viruses carry oncogenes, or regulatory genes that become oncogenes

10 Carcinogens Hereditary predisposition
Cancer tends to be more common in some families The disease itself is often not inherited, but susceptibility to risk factors that create oncogenes are Some oncogenes, however, are directly inherited (ex: retinoblastoma)

11 Tumors Small group of tumor cells = primary growth
Benign: do no spread from site of origin, but can compress and displace surrounding tissue Malignant: cancerous tumors. Spread throughout body and invade other tissues, eventually destroying them

12 Malignant tumors Interfere with normal functioning of tissue where they grow Cells can break off and spread through the blood and lymph to form secondary growths Spread of cancer by secondary growths is called metastasis


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