NETA Personal Trainer Exam 2025 – 400 Free Practice Questions to Pass the Exam

The type of muscle tissue that is involuntary and specifically found in the walls of the heart is cardiac muscle. This tissue is unique to the heart and is responsible for the rhythmic and automatic contractions that pump blood throughout the body. Cardiac muscle fibers are interconnected and exhibit a striated appearance, much like skeletal muscle, but they operate under involuntary control, meaning they are not consciously controlled.

Skeletal muscle, while striated as well, is under voluntary control and is attached to the bones, allowing for movement of the skeleton. Smooth muscle is also involuntary but is primarily found in the walls of hollow organs, such as the intestines and blood vessels, rather than the heart itself. The term "striated" refers to the appearance of both skeletal and cardiac muscle under a microscope, but it does not define the location or type of control (voluntary or involuntary) of the muscle tissue. Hence, cardiac muscle is the specific answer here, as it uniquely fulfills these characteristics adjacent to the heart's structure and function.