Question

The active tension ______ as the muscle is stretched beyond normal length, which is when sarcomere length is ______
increases, less than 1.65 µm
decreases, more than 2.2 µm
increases, less than 1.65 mm
decreases, more than 2.2 mm​

Answer 1

Answer:

decreases, more than 2.2 mm

Explanation:

The maximal active tension corresponds in cardiac muscle to a sarcomere length of about 2.2 mm. Cardiac muscle, unlike skeletal muscle, does not display a descending limb on the active tension curved because the greater stiffness of cardiac muscle normally prevents its sarcomeres from being stretched beyond 2.2 mm.