Tobacco smoke contains carbon monoxide whichA Reduces the concentration of haembound oxygen in blood B Causes cirrhosis of liver C Raises blood pressure D Is carcinogenic

Tobacco smoke does indeed contain carbon monoxide. This gas has several effects on the body, including:

A. Reducing the concentration of haem-bound oxygen in blood: Carbon monoxide binds to haemoglobin, the molecule in red blood cells that carries oxygen, more readily than oxygen does. This means that if there is a lot of carbon monoxide in the air, your body may replace the oxygen in your blood with carbon monoxide, reducing the amount of oxygen reaching your tissues and organs.

B. Causes cirrhosis of the liver: This is not directly caused by carbon monoxide. Cirrhosis of the liver is most commonly caused by alcohol abuse, hepatitis, and non-alcoholic fatty liver disease.

C. Raises blood pressure: Carbon monoxide can indeed raise blood pressure by forcing the heart to work harder to supply the body with the oxygen it needs.

D. Is carcinogenic: Carbon monoxide itself is not classified as a carcinogen. However, tobacco smoke contains many other chemicals that are known carcinogens.

So, the most accurate answer to your question would be A and C. Carbon monoxide in tobacco smoke reduces the concentration of haem-bound oxygen in blood and raises blood pressure.