Striated Muscle

Striated muscle refers to a type of muscle tissue that is characterized by its striped appearance under a microscope. This appearance is due to the arrangement of contractile proteins within the muscle fibers. Striated muscle can be further classified into two types: skeletal muscle and cardiac muscle.

Skeletal Muscle

Skeletal muscle is a type of striated muscle that is attached to the skeleton and responsible for voluntary movements. It is under conscious control, meaning that it can be consciously contracted or relaxed by the individual. Skeletal muscle is responsible for various functions, including locomotion, posture maintenance, and facial expressions.

Visceral Muscle

Visceral muscle, also known as smooth muscle, is a type of muscle tissue that is found in the walls of internal organs, such as the stomach, intestines, and blood vessels. Unlike skeletal muscle, visceral muscle is not under conscious control and is therefore involuntary. It functions to move substances through the organs and regulate the size of blood vessels, among other things.

Voluntary Muscle

Voluntary muscle refers to muscle tissue that is under conscious control. It can be contracted or relaxed voluntarily by the individual. Skeletal muscle is an example of voluntary muscle, as it is responsible for voluntary movements. On the other hand, smooth muscle, including visceral muscle, is involuntary and cannot be consciously controlled.

Explanation

Given the options, the correct answer is option A - Visceral muscle. This is because visceral muscle, also known as smooth muscle, does not have the characteristic striped or striated appearance under a microscope. Smooth muscle lacks the organized arrangement of contractile proteins that give skeletal and cardiac muscle their striped appearance. Visceral muscle is responsible for involuntary movements, such as the contraction of the stomach during digestion or the constriction of blood vessels. It is found in the walls of internal organs and does not exhibit the striations seen in striated muscle tissue.