State the effects of chemicals on human beings.

Effects of chemical on human beings are:

1. Fluorides cause fluorosis, humped back, stiffness of bone joints and dental fluorosis.
2. Lead is toxic to both central and peripheral nervous system. It can accumulate in the bones.
3. Pesticides can cause tumours, chromosomal alterations, brain damage, impotency and cancer.
4. Arsenic, in mild doses, causes nausea, vomiting and stomach burns. In lethal doses, it may cause death due to shock and vascular failure.
5. Mercury damages the nervous system. It may lead to insomnia, tremors, bleeding of gums etc. Methyl mercury may cause Minamata disease which is a form of mercury poisoning.
6. High nitrate content of water is associated with methemoglobinemia. Infants are most susceptible to Nitrate content.