Smooth muscles are present in all except:
Correct answer: D. Alveoli
- A. Trachea
- B. Bronchi
- C. Bronchioles
- D. Alveoli
Explanation
The alveoli are the smallest air sacs in the lungs. They are surrounded by a network of capillaries, and they are where gas exchange takes place. Alveoli do not have smooth muscles. Their wall is also one cell thick.
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About Digestion
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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