Types of fibers

Types of fibers

1. Are classified according to

   • Speed of contraction and fatigue resistance
     • Exists
       • Type II and Type II (A and B)

2. Type I fiber

   • slow twitch (oxidative )
     • dependent phosphorylation
       • Contraction: contraction lasts 10 times longer than fast twitch fibers

3. Type II fiber (A and B)

   • Type IIA: oxidative glycolytic fibers
     • Fast contraction
       • Type IIB: Glycolytic fibers
         • Fast contraction and fast fatigue
   • Divide faster ATP
     • and
       • speed of contraction depends:
         • On the myosin heads
           • And the type of fiber

4. Myoglobin

   • Red pigment fixer oxygen
     • Depending in the amount of myoglobin
       • Classified fibers
         • Oxidative: red muscle and Glycolytic: white muscle