APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system. Smooth muscle cannot be controlled consciously and thus acts involuntarily.

Detailed explanation-2: -Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

Detailed explanation-3: -At a cellular level, smooth muscle functions as an involuntary non-striated muscle. Smooth muscle contains thick and thin filaments that do not arrange into sarcomeres, resulting in a non-striated pattern.

Detailed explanation-4: -False. Smooth muscle is a type of involuntary non-striated muscle. Smooth muscles are found in the walls of organs such as the stomach, intestines, arteries and veins. Smooth muscles move involuntarily through the action of the autonomic nervous system responding to stimuli.

Detailed explanation-5: -Muscles that can be controlled at will are referred to as voluntary muscles. Those that are not under the control of the will (volition) are called involuntary muscles. Smooth muscles are involuntary muscles.