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.
Fiber Types and Skeletal Muscle Hypertrophy The force generated by a muscle is dependent on its size and the muscle fiber type composition. Skeletal muscle fibers are classified into two major categories; slow-twitch (Type 1) and fast-twitch fibers (Type II).
The muscle fiber is now receiving Na+, which makes the inside of the muscle fiber more positively charged. This triggers a muscle action potential, which leads to a contraction of the muscle fiber; a more positively charged or depolarized muscle fiber forms the basis of how muscles contract. The binding of receptors is short lived, however, because the acetylcholine that is binding the receptors is quickly broken down.