Chemical digestion of carbohydrates and lipids begins in the while chemical digestion of proteins begins in the see section 41.3 (page 860) .a. large intestine; mouthb. small intestine; stomachc. mouth; stomachd. stomach; mouth

The answer is "c"

Chemical digestion of carbohydrates and lipids begins in the mouth, while chemical digestion of proteins begins in the stomach.

Explanation:

The chemical digestion is a catabolism process where enzymes hydrolyze the large macronutrients (lipids, carbohydrates, proteins) breaking them down into small molecules.

The metabolism of carbohydrates begins at the mouth, where the salivar amylases break the glucose bonds down of the amylose (vegetal source) into disaccharides and the ones of the glycogen (animal source) into polysaccharides. Then in the stomach the HCl hydrolyze disaccharides and in the small intestine the pancreas amylase enables the breakdown of the disaccharides into monosaccharides to be absorb.

The chemical metabolism of the lipids (short-chain) starts in the mouth when they are hydrolize by the action of lipase in saliva, breaking the glycerol fatty acid bonds down, forming diglycerides. Then the bile salts emulsify the lipids allowing that the fats are solubilized in the chyme, and after that the pancreas lipase breaks fats into fatty acids in the small intestine.

The digestion of protein initiates in the stomach through the action of the pepsin and then at the duodenum, the trypsin and chymiotrypsin secreted by the pancreas continue with the hydrolyzation of the peptidic bonds (carbon-nitrogen).

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