Question

state the role of the following in human digestive system:
digestive enzymes
hydrochloric acid
villi

Answer 1

Hydrocloric acid _helps in the digestion...provids acidic medium for digestion of food
villi helps in absorption of food
enzymes helos in conversion of protiens into amono acids

Answer 2

Answer:

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(i) Digestive enzymes – Foods need to be broken into their small or simpler

molecules so that they can be absorbed into the bloodstream. However, the physical breakdown of food is not enough. Enzymes are hence needed for the chemical breakdown of food and speeding up the digestive process. The products of digestion can hence be small enough to be absorbed.

(ii) Hydrochloric acid – Hydrochloric acid helps to kill the germs which might have entered into the system through food. It creates an acidic medium for the pepsin to act on food to breakdown proteins.

(iii) Villi – Villi are finger-like projections in the small intestine. They help to increase the surface area for absorption of the digested food. Villi are richly supplied with blood vessels which help to absorb digested food into the bloodstream.