Hawaii Massage License Practice Exam

Which of the following is an example of an involuntary muscle?

1. Cardiac muscle

2. Latissimus dorsi

3. Biceps

4. Quadriceps

The correct answer is: Cardiac muscle

An example of an involuntary muscle is cardiac muscle. Cardiac muscle is found only in the heart and operates without conscious control, meaning it functions automatically to pump blood throughout the body. This involuntary nature is crucial for survival, as it allows the heart to maintain a steady rhythm and respond to the body’s needs for oxygenated blood without requiring an individual's conscious input. In contrast, the other muscles listed—latissimus dorsi, biceps, and quadriceps—are examples of voluntary muscles. These muscles are under conscious control, enabling individuals to choose to contract or relax them during activities such as lifting, throwing, or walking. The distinction between voluntary and involuntary muscle types is essential in understanding how different muscles function and their roles in the body's movement and overall physiology.