Nephritis is the most common cause of blood in the urine of children and young adults but it can occur at any age. If your GP suspects nephritis he will usually refer you to a nephrologist (kidney doctor).
Muscle fiber types can be broken down into two main types: slow twitch (Type I) muscle fibers and fast twitch (Type II) muscle fibers. These fast twitch fibers can be further categorized into Type IIa and Type IIb fibers, which are also known as fast twitch oxidative and fast twitch glycolytic, respectively.
White fibers tend to have little to no myoglobin. Muscle fibers in general are categorized into three types, based on type of myoglobin (fast or slow) and the method it uses to produce ATP (glycolysis or oxidative phosphorylation): Type I. Slow twitch.Slower to contract, but also slower to fatigue.hite fibers tend to have little to no myoglobin. Muscle fibers in general are categorized into three types, based on type of myoglobin (fast or slow) and the method it uses to produce ATP (glycolysis or oxidative phosphorylation): Type I. Slow twitch. Slower to contract, but also slower to fatigue.