Normal levels of creatinine in the blood are approximately 0.6 to 1.2 milligrams (mg) per deciliter (dL) in adult males and 0.5 to 1.1 milligrams per deciliter in adult females. Muscular young or middle-aged adults may have more creatinine in their blood than the norm for the general population.
Types of muscle fibers. Skeletal muscle, the type that is responsible for moving our muscles when we run, is comprised of three different muscle fiber types, each with its own advantages, disadvantages, and specialty.
1 Biceps and triceps are antagonistic pairs. 2  The biceps muscle works across three joints and the most important of these functions is to flex the elbow, while the triceps muscle is the muscle principally responsible for extension of the elbow joint.ogether the skeletal muscles work with your bones to give your body power and strength. Skeletal muscles are held to the bones with the help of tendons. Tendons are cords made of tough tissue, and they work as special connector pieces between bone and muscle.