1. Slow fiber (Red fiber) e.g. diaphragm
Muscle fiber is red that composed of the
number of myoglobin, oxidative enzyme
and mitochondria.
Ca2+ from Sarcoplasmic reticulum releases
in middle speed
This muscle has slow contraction with high
length of contraction that hard to fatigue.
2. Fast fiber (White fiber) e.g. finger muscle.
Muscle fiber is redless that has a small
number of myoglobin, oxidative enzyme
and mitochondria.
But the glycolytic enzyme system is fully
developed.
It can give energy in short period because
the release of Ca from SR is fast that has
12 fast contraction.
It’s easy to be fatigue muscle