Two types of skeletal muscle

• Red skeletal muscle fibers:

1. Type I
2. high myoglobin & mitochondria content
3. aerobic
4. low ATPase
5. slow movement muscle, posture-maintainig muscle

• White skeletal muscle fibers:

1. Type II
2. low myoglobin & mitochondria content
3. anaerobic
4. high ATPase
5. fast movement muscle: eye muscles, hands, legs