cancer

• genes tell cells when to divide and when to stop dividing
• some changes may take place in these genes and that can lead to uncontrolled growth and mitosis this produces tumour
• benign tumours are growth of abnormal cells which are found in one area
• benign ususally contained within a membrance and stay in one place
• malignant tumour invade neighbouring tissues and move into bloodstreams
• once in the bloodstream malignant cells spread to different part of the body and form new tumours called secondary tumours
• 1.cancers linked to genetics eg. breast cancer and prostate cancer
• 2. cancer can be linked to lifestyle eg smoking: lung cancer, ultraviolet: skin cancer, Alchool: mouth and throat cancer
• radon is a radiactive gas which increase the risk of developing lung cancer this is because radon releases ionising radiation which damages the dna in cells this can cause uncontrolled cell division leading to cancer