5. Write the difference between :
(a) Actin and Myosin
The differences between actin and myosin are as follows:
Actin | Myosin |
Actin refers to the thin and short contractile protein. | Myosin refers to the thick and long contractile protein. |
Actin is found in light bands called isotropic bands. They are found between the A and I bands. | Myosin is found in dark bands called anisotropic bands. They are found between the A bands of a sarcomere. |
Actin contains regulatory proteins called tropomyosin and troponin. | Myosin contains regulatory proteins called meromyosin. |
Actin filaments have a smooth surface and they do not form cross-bridges. | Myosin filaments have a rough surface and they form cross-bridges. |