Mitosis & Cancer: When Making New Cells Goes Terribly Wrong!
When is mitosis a good thing? When you have to add or replace cells growth & development repair replacement
When is mitosis a BAD thing When cells reproduce & they are not needed these cells take over organs, but don’t do the right job they just keep making copies cancer damages organs
What is cancer? Disease where body cells reproduce at an abnormal rate. Mitosis occurring at a rapid rate – increasing the # of cells when not needed Shape and nucleus of cell have been damaged. Abnormal cells start to crowd and invade normal cells.
Why would cells just make copies? If DNA gets damaged, cells stop listening to correct instructions Carcinogens (mutations) Causes of mutations: UV radiation chemical exposure radiation exposure viruses cigarette smoke pollution age genetics
Tumors Benign tumor abnormal cells remain at original site as a lump most do not cause serious problems & can be removed by surgery
Tumors Malignant tumor cells leave original site carried by blood system to other tissues start more tumors damage functions of organs throughout body
Treatments for cancers Treatments kill rapidly dividing cells chemotherapy poisonous drugs that kill rapidly dividing cells radiation high energy beam kills rapidly dividing cells side effects
Treatments for cancers Surgery Cut out tumor and some healthy cells around it To decrease spreading Biological Therapies Use body’s immune system to fight cancer cells Often used to lessen the side effects of radiation and chemotherapy
How can I help prevent cancer? Healthy lifestyle and environment can help you prevent cancer. No smoking Eat healthy Exercise Sun safety Early detection Get tested (prostate, pap)