In contraction the amount of tension increases during contraction, but the length of the muscle does not change.

Isometric

Explanation:

Isometric contraction may be defined as the type of contraction that produces the muscle tension. No change in the angle of the skeletal joint is noticed in the isometric contraction.

The sarcomere shortens during the muscle contraction this causes the increase in the muscle tension of the muscle. The length of the muscle do not change in the isometric contraction. The isometric contraction is important for maintaining posture.

Thus, the correct answer is isometric contraction.

the real answer is b. scintillation counter