The circulation of skeletal muscle involves the largest mass of tissue in the body: 30 to 40% of an adult's body weight. At rest, the skeletal muscle vasculature accounts for about 25% of systemic vascular resistance, even though individual muscles receive a low blood flow of about 2 to 6 mL/min per 100 g. The dominant mechanism controlling skeletal muscle resistance at rest is the sympathetic nervous system. Resting skeletal muscle has remarkably low oxygen consumption per 100 g of tissue, but its large mass makes its metabolic rate a major contributor to the total oxygen consumption in a resting person.
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Metabolism. There isn’t perhaps a more frequently used word in the weight loss (and weight gain) vocabulary than this. Indeed, it’s not uncommon to overhear people talking about their struggles or triumphs over the holiday bulge or love handles in terms of whether their metabolism is working, or not.