What term describes the ability a muscle to vary its degree

What term describes the ability a muscle to vary its degree shortening to generate the strength needed to 5lb weight Isometric contractions responses isotonic contractions which these muscles the upper limb brachialis external oblique trapezes which these terms refers to the shape of muscle deltoid biceps mastoid which movement is associated with hand actually occurs in the forearm? opposition supination inversion dossiflexion.

Solution

1) Greaded muscle

2) Trapezius

3) Deltoid

4) supination

In forearm muscle, two kinds of possible movemnts occurs they are supination and pronation,

Supination is movement occurs in lower forearm , it leads to the turning of hand palm outer side .