A structure that does not contain cartilage:
Correct answer: D. All A,B,C
- A. Alveolar duct
- B. Alveolar sacs
- C. Alveoli
- D. All A,B,C
Explanation
Cartilage is only present in the upper respiratory tract. Terminal bronchiole, respiratory bronchiole, alveolar duct and alveoli do not contain cartilage.
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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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