How Protein Becomes Muscle
Digestion: Enzymes in your stomach and small intestines break the protein into peptides, combinations of at least two or three amino acids (a.k.a your body's building blocks). Then other enzymes further dice the peptides into individual amino acids.
Transport: The amino acids travel directly from your gastrointestinal tract to your liver via the hepatic portal vein. While the liver's main job is to detoxify the blood, it also propels amino acids back into your bloodstream for delivery to your muscles.
Response: Your muscles are essentially bundles of long fibers. Strength training cause microtears in these fibers that signal your immune system to send out a work crew (growth hormone and stem cells) and repair material (amino acids) to the damaged areas.
Construction: Your DNA acts as a construction foreman: It calls up specific amino acids, directs their deployment, and assigns their roles. The muscle fiber work crew uses the fresh supply of amino acids to weave myofibrils; these are bundles of the protein filaments myosin and actin, which are critical to muscle contraction.
Repair And Growth: The newly made myofibrils fuse with the damaged areas of your muscle fibers. But microtear repair is more than just a patch job: These myofibrils also help make the muscle bigger and stronger than it was before. Time to flex.
- RRS DesignsGraphics, present
- Inter-American University of Puerto RicoComputer Science, 1998 - 2001
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