Describe the color, fatiguability, contraction speed of Type I, Type II A and Type II B muscle fibers.
Which has the lowest myoglobin count? Highest? Which is most resitant to fatigue and most susceptible to fatigue?
1. Type I: slow-twitch, lots of mitochondria, slow to fatigue, slow contraction velocity.
Type IIA: fast twitch, contract rapidly, resistant to fatigue, but not as much as Type I.
Type II B: Low myoglobin content (high glycogen content) contract rapidly and fatigue rapidly.