The type of muscle tissue that is both striated and involuntary is known as cardiac muscle. This specialized tissue is found only in the heart and is responsible for pumping blood throughout the body.
Cardiac muscle fibers are striated, which means they have a banded appearance under a microscope. This striation is similar to that seen in skeletal muscle, indicating that cardiac fibers have organized structures for contraction. However, unlike skeletal muscle, which is under voluntary control, cardiac muscle operates involuntarily. This means that we do not consciously control the heartbeat; rather, it is regulated by the autonomic nervous system and intrinsic pacemaker cells within the heart.
In summary, cardiac muscle is the only type of muscle tissue that is both striated and involuntary, playing a crucial role in sustaining life by ensuring continuous blood circulation.