Why are biceps and triceps muscles called voluntary muscles?

Biceps and triceps muscles are classified as voluntary muscles because they are under conscious control, allowing individuals to decide when to contract and relax them. This is in contrast to involuntary muscles, such as those found in the heart and digestive system, which operate automatically without conscious thought. The ability to control these muscles enables precise movements, such as lifting and lowering objects. Thus, their function is directly linked to voluntary motor commands from the brain.