New York State Basic Emergency Medical Technician (EMT-B) Practice Exam

Which statement accurately describes skeletal muscles?

1. They relax quickly and are involuntary

2. They contract slowly and are involuntary

3. They relax quickly and are voluntary

4. They contract rapidly and are involuntary

The correct answer is: They relax quickly and are voluntary

Skeletal muscles are characterized by their voluntary control and ability to contract rapidly. These muscles are responsible for movements that you consciously initiate, such as walking, running, or lifting objects. When you decide to move, your brain sends signals to the skeletal muscles, prompting them to contract. The fact that skeletal muscles can relax quickly also highlights their nature; they can rapidly respond to voluntary commands and produce quick, powerful movements. This allows for a wide range of activities, from fine motor skills to vigorous exercise. In contrast, other types of muscle, such as smooth and cardiac muscle, operate involuntarily, meaning they function without conscious control and tend to contract more slowly. This distinction sets skeletal muscles apart in both their function and control mechanism.