Explain the different pathways of protein metabolism in human body.

Protein metabolism in the human body involves several key pathways that are essential for maintaining cellular functions, tissue repair, and overall homeostasis. Proteins, which are made up of amino acids, undergo a series of biochemical processes, including digestion, absorption, synthesis, and catabolism. These processes take place in various organs and tissues, primarily the digestive system, liver, muscles, and kidneys. The pathways of protein metabolism can be broadly categorized into anabolic (building) and catabolic (breaking down) pathways.

Digestion and Absorption of Proteins

The first step in protein metabolism is the digestion of dietary proteins, which occurs primarily in the stomach and small intestine. The protein in food is broken down into smaller peptides and individual amino acids by enzymes like pepsin in the stomach and trypsin, chymotrypsin, and __________ __________ _____ _________ _________ _________ ____.
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