|
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. |
Draw the diagram of a sarcomere of skeletal muscle showing different regions.
Describe the important steps in muscle contraction.
Match Column I with Column II :
| A. Smooth muscle | (i) Myoglobin |
| B. Tropomyosin | (ii) Thin filament |
| C. Red Muscles | (iii) Sutures |
| D. Red Muscles | (iv) Involuntary |
