Which of the following pairs is not correctly matched?
a. i band - contains only thin filaments
b. z disc - marks the each end of the sarcomere
c. h zone - contains only thick filaments sarcomere
d. a band - light central region of sarcomere

A band - light central region of sarcomere.

Explanation:

Sarcomere is the basic structural unit of the skeletal muscles. These sarcomere shows striations ( light and dark bands) when veiw under the microscope.

A band or anisotropic band is the dark region of sarcomere. A band consists of both thick and thin filaments of actin and myosin proteins. The A band has the ability to refract light and appears dark.

Thus, the correct answer is option (D).

answer; /// i believe that the correct answer is (50%);