Question

Unstriped muscles are also known as
A. Visceral
B. Smooth
C. Involuntary
D. All of these

Answer 1

Hint: Unstriped muscles are most commonly found in the lungs and other parts of the body. As its name indicates, it lacks striations.

Complete answer:
A muscle can be used in the body in various ways. A certain muscle can seldom contract with much strength, while another muscle tends to contract with limited strength. Animals have produced a multitude of applications that can build a muscle. For flight, swimming and running, muscles have developed. They have also grown into circulatory and digestive pumps.

The body contains three different types of muscles (skeletal, cardiac, and smooth). All three muscle tissues share similar characteristics, each with a quality that is known to excitability, as their plasma membranes can alter their electrical conditions (from polarized to depolarized) and send an electrical wave, known as an action potential within the membrane.

Unstriped muscles are popularly known as visceral muscles as it resides in the walls of hollow organs such as the urinary bladder, the uterus, the lungs, intestines and passageways walls, such as the arteries and veins and the digestive, urinary and reproductive tract. The smooth muscle also exists in the eyes, where it affects the size of an iris and the lens; and in the skin, where hair stands straight in response to cold or fear. Also, these muscles do not exhibit any stripes or striations thus, can be called as smooth muscles.

ANS is the innervation of the smooth muscle; therefore, the smooth muscle is the involuntary muscle. In addition, due to gap junctions between smooth muscle cells, many cells do not receive nerve fibers.
Hence, the option (D) is the correct choice.

Note:
Muscle tissue that contracts without conscious control has the shape of thin layers or sheets consisting of spindle, single-nucleus cells contained in internal organs walls, including the stomach, gut, bladder, and blood vessels outside the heart are well-known as unstriped muscles.