Source of energy for muscle contraction
Chemical composition of muscle • Skeletal Muscle 1. Water : ≈75% the muscle weight 2. Muscle proteins : ≈20% of the muscle mass • contractile proteins (actin, myosin, troponin and tropomyosin) • Myogen, myoglobin. 3 . Organic substances : • Carbohydrates : glycogen and hexaphosphate • Lipids : neutral fat, cholesterol, lecithin and steroids • Nitrogenous substance s : ATP, adenylic acid, creatine, phosphocreatine, urea, uric acid, xanthine and hypoxanthine. 4. Inorganic substances: • Cation s : potassium, sodium, calcium, magnesium and • Anions : chloride, phosphate and sulphate. Energy source for muscle contraction • Muscle contraction requires lot of energy • “a machine for converting chemical energy into mechanical work” • Immediate source of energy: ATP • Ultimate source: intermediary metabolism of carbohydrate and lipids. Adenosine Triphosphate • Adenosine-PO3 ~ PO3 ~ PO3 ( HIGH ENERGY COME DUE TO PHSPHATE BOND BREAK DOWN) • 7300 calories of energy per mole of A...