Question

Which of the following is an example of an organ that contains a smooth muscle?
A. Iris of eye
B. Uterus
C. Bronchi
D. All of these

Answer 1

Hint:
Before we proceed with the problem, we must know the definitions of Smooth muscle.
Smooth muscle is an involuntary, non-striated muscle at the cellular level. Smooth muscle has a non-striated pattern because it comprises thick and thin filaments that are not organized into sarcomeres. When examined under a microscope, it will show as homogeneous. Smooth muscle is a kind of tissue in the walls of hollow organs like the stomach, uterus, and intestines.

Complete step by step answer:
The non-striated muscle is another name for smooth muscle.
The muscle fibres present in smooth muscle are long, narrow, spindle-shaped, and tapering at the end.
Smooth muscles are uninucleated.
They also form tubes or sheets on the wall of visceral organs.
They are present on the walls of hollow organs, the iris of the eye, the dermis of the skin, the lungs, the bronchi, the ureter, the uterus, the alimentary canal, blood vessels, etc.
Thus, the iris of the eye, bronchi, and uterus is an example of an organ that contains smooth muscle.
Smooth muscle has a non-striated pattern because it comprises thick and thin filaments that are not organized into sarcomeres.

Option ‘D’ is correct

Note:
The ability of smooth muscles to be involuntarily constricted and controlled is the most obvious way that they vary from other bodily muscles. Smooth muscles are not striated like cardiac and skeletal muscles are. Their name suggests that they have a smooth appearance, and these muscles are used in the body system to exert pressure on blood vessels and other organs.