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What are the following diseases and what are they due to ? (i) Asphyxiation (i) Pneumoconiosis (iii) Black foot (iv) Methemoglobinemia |
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Answer» Solution :(i) Asphyxiation. Acute oxygen-starvation in the blood is called asphyxiation or anoxia. It happens when a person stays for long in the air having a concentration of CO more than 750 ppm. (ii) Pneumoconiosis. It is a DISEASE of lungs commonly found in industrial workers. It is due to accumulation of small particulates in the lungs which act as sites for absorption of carcinogenic compounds such as polynuclear hydrocarbons, asbestos etc. (iii) Black foot. It is a peripheral vascular disease in which the blood vessels in the lower limbs are severely damaged resulting eventually in gangrene. It is due to high concentration of ARSENIC in ground water. (iv) Methemoglobinemia. It is a blue BABY syndrome which results in a blue colour skin and a congenital (from BIRTH) HEART defect in infants which laymen often call hole in the heart'. It occurs when water used for drinking contains nitrates gt 50 ppm. |
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