11.5 Cancer causing (cancer causing) environmental substances and methods of its control: Health and environment part 2
11.5 Cancer causing (cancer causing) environmental substances and methods of its control: Cancer is a group of related diseases occurring in the cells of the body. Normally, one cell can produce many cells as needed to grow, grow and heal the useless (damaged) cells of the body. The continuous division and growth of cells keeps the human body normal and healthy. But sometimes these cells continue to divide even without need. These cells come together to form a group called a tumor (Tumor tumor). These tumors can be either benign benign or malignant malignant. Often they are removed by surgery and do not regenerate. These benign tumors also do not spread to other parts of the body and neither do they pose any life risk. In contrast, malignant tumors are cancerous. The cells of these tumors are abnormal and they divide and regroup without any control. They affect the surrounding tissues and organs by harming them. The cells of this tumor divide and reach into the blood stream or lymp