State the role of the following in human digestive system:
(a) Digestive enzymes
(b) Hydrochloric acid (HCl)
(c) Villi
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Explanation:
a.Digestive enzymes acts as biocatalyst which break down complex substances into simple so that it can be converted into jniform source of energy.
b. It activates protein digesting enzyme pepsin by making the foof medium acidic.It also kills various pathogens intaken along with food.
c. Villi are projectikns on inner lining of the small intestine which increases the surface area for absorption of digested food.
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