The way that humans move is muscles will contract and muscles actually at the end of them will come together to form a tendon. So you've got muscles throughout your body, up and down. They have different orientations and they have different responsibilities. Muscle contraction is in large part what squeezes the blood back up into your heart and into your lung. It is the amino acid reserve. That's the place where you store amino acids so that you can use them to create red blood cells or immune cells or anything else.

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