If a muscle is a voluntary muscle what does that mean?

Answer 1

The tricep muscle is mainly responsible for the straightening of the arm. This means that the tricep muscles are voluntary, and will only move if we wish to straighten out our arms.

Answer 2

A voluntary muscle is a muscle under our conscious control. For instance, If I want to move my head, arms, legs, and eat using my jaw, etc. to do so I use muscles that I can control, and only use them when I want to. A good example of an involuntary muscle (which I think is more important!) is our heart (a four-chambered muscular pump) - imagine having to consciously make our heart beat - and then forget or fall asleep!