State two differences between red and white muscles.
Red Muscles | White Muscles |
Have more mitochondria | Have less mitochondria |
Presence of myoglobin. | Absence of myoglobin. |
Have slow rate of contraction. | Have fast rate of contraction. |
Actin |
Myosin |
1. It is thin low molecular weight filamentous protein present in the sarcomere. |
1. It is thick filamentous protein present in the sarcomere. |
2. It occurs in two forms the monomeric G-actin and polymeric F-actin. |
2. Each myosin molecule has two components—a tail and head. The tail is formed of heavy meromyosin (HMM) while the head is formed of light meroyosin LMM. |
3. The contractile protein called tropomyosin. |
3. The head has contractile property. |
4. It does not act as ATPase |
4. The head acts as ATPase. |