Third Artcle Notes

• Cancer is caused in all, or almost all, instances by alterations in DNA called mutations
• The body has a strict regulation system so that only a minute fraction of the cells that mutate in the body ever lead to cancer
• Genetic makeup is part of the reason that some individuals who live a very healthy lifestyle die of cancer, while others who have poor dietary and personal habits do not
•  Ionizing radiation may be divided into two major types: electromagnetic radiation and particulate radiation
•  Electromagnetic radiation includes X rays and gamma rays. Particulate radiation includes electrons, protons, neutrons, alpha particles, and heavy ions
• A widespread source of radiation is radon, a colorless, odorless gas that occurs naturally in rocks and soil
• Exposure to sunlight is the greatest risk factor for radiation-related cancer
•  The risk of skin cancer has increased with the depletion of stratospheric ozone, which protects us from the Sun's ultraviolet rays
• Some forms of electromagnetic energy, including microwaves, radio waves, and low-frequency radiation
• A growing body of evidence links diet with cancer
• There are 50 cancer-causing substances in cigarette smoke