Question

multiple choice question
in regard to the biceps muscle, the up - phase of a pull - up involves a(n) ____ contraction, while the down - phase involves a(n) ____ contraction.
o eccentric; concentric
o isometric; isokinetic
o isokinetic; isometric
o concentric; eccentric

Explanation:

A concentric contraction occurs when the muscle shortens to produce force during the up - phase of a pull - up, like when the biceps helps lift the body up. An eccentric contraction happens when the muscle lengthens while still under tension during the down - phase of a pull - up, as the biceps controls the body's descent.

Answer:

D. concentric; eccentric