In heavy smokers the alveoli become enlarged and damaged which reduces the surface area for the exchange of respiratory gases.This condition is called:
Correct answer: B. Emphysema
- A. Lung cancer
- B. Emphysema
- C. Ashtma
- D. Bronchitis
Explanation
In heavy smokers, prolonged exposure to harmful chemicals in tobacco smoke can lead to the destruction and enlargement of the alveoli in the lungs. This condition is known as emphysema, and it results in reduced surface area for gas exchange, leading to difficulty in breathing and reduced oxygen absorption.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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