Digestion of Major Nutrients - Proteins

4 important questions on Digestion of Major Nutrients - Proteins

What does the luminal phase of protein digestion do?

Hydrolysis of proteins into peptides via activated zymogens (proteolytic enzymes such as pepsin, chymosin, trypsin) in both the stomach and small intestine

What does the membranous phase of protein digestine do?

Membrane bound peptidases in small intestine further break down peptides into free amino acids and di-and tri-peptides.

How are free amino acids and di- and tri-peptides absorbed?

They are transported via 4 different Na+ symporters
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How is the neonatal gut different for protein absorption?

They have specialized enterocytes that line the small intestine, which allow pinocytosis of intact proteins shortly after birth. This is for better antibody absorption in colostrum.

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