State the role of the following in human digestive system :
(i) Digestive enzymes (ii) Hydrochloric acid (iii) Villi
Answers
Answer:
Explanation:
Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb.
The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria. ... Together with the bicarbonate, this ensures that the stomach wall itself is not damaged by the hydrochloric acid.
The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions. ... The surface of these folds contains tiny projections called villi and microvilli, which further increase the total area for absorption.