Where does the process of digestion begin? Are nutrients absorbed from the large intestine?

Digestion begins in the mouth. Nutrients are not absorbed from the large intestine.

The tongue is involved in secretion of mucins and the enzyme lingual lipase which breaks down some fats.

The parotid salivary glands produce a serous fluid that contains a large amounts of salivary amylase for breaking down sugars.

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The submandibular salivary glands secrete a mixture of buffers, glycoproteins called mucins, and salivary amylase.

The small intestine (very long but very small in diameter) is where most nutrients are absorbed.

The large intestines (very short but wide) absorb electrolytes and water.