Elastic fibers and muscles are absent in?
Correct answer: C. Capillaries
- A. Arteries
- B. Veins
- C. Capillaries
- D. Present in all
Explanation
Capillaries are the smallest blood vessels in the body. They are only about one cell thick, and they allow nutrients and oxygen to pass from the blood to the cells. Capillaries do not have elastic fibers or muscles, so they cannot expand or contract. This is why blood pressure is lower in capillaries than in veins and arteries.
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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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