What is the primary function of skeletal muscles?

The primary function of skeletal muscles is to facilitate voluntary movement of the body. Skeletal muscles are under conscious control, meaning that they can be contracted and relaxed at will. This allows individuals to perform a wide range of activities, from simple movements like walking and reaching to complex actions like dancing or playing a sport.

Skeletal muscles work by contracting, which pulls on bones and creates movement at joints. This system of muscles and bones is crucial for maintaining posture and enabling locomotion. Additionally, skeletal muscles play a role in other functions such as maintaining body temperature through heat production during muscle activity.

The other options identify functions commonly associated with different types of muscle or body systems. While supporting the body's structure and protecting internal organs are important, they are not the primary function of skeletal muscles, which primarily enable deliberate, voluntary movement.