Final answer:
Cardiac muscle tissue is the only type of muscle tissue that is both striated and acts involuntarily, which means it works automatically without conscious control and is found exclusively in the heart.
Step-by-step explanation:
The type of muscle tissue that is both striated and involuntary is cardiac muscle tissue. There are three main types of muscle tissues in animal bodies: skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle is under voluntary control, which means it can be consciously controlled, while smooth muscle, found in walls of hollow organs like the intestines, acts involuntarily.
However, cardiac muscle, which is only found in the heart, shares a characteristic with skeletal muscle in that it appears striated due to the presence of sarcomeres in a highly regular arrangement of bundles. Unlike skeletal muscle, cardiac muscle is involuntary, meaning it functions without conscious control to pump blood throughout the body and maintain blood pressure.