State one role of each of the following in human digestive system: (i) Hydrochloric acid (ii) Villi (iii) Anal Sphincter (iv) Lipase
Explanation
Hydrochloric acid is a digestive enzyme that breaks down proteins into peptides. Villi are small finger-like projections in the small intestine that increase the surface area for absorption of nutrients. Anal sphincter is a muscle that controls the release of waste products from the body. Lipase is an enzyme that breaks down fats into glycerol and fatty acids.
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