Correct Option
The correct option isSmooth muscle
Explanation
Muscle tissues in animals are classified into three types based on their structure and function: skeletal (striated/voluntary), smooth (non-striated/involuntary), and cardiac (striated/involuntary). The location of these tissues depends on whether the movement they control is voluntary or involuntary.
Option Analysis
- Smooth Muscle (Correct): These are involuntary and non-striated muscles (fusiform shape). They are primarily found in the walls of hollow internal organs (viscera) such as blood vessels, the stomach, intestines, ureters, and the bronchi of the lungs. They are also present in the iris and ciliary body of the eye to regulate the size of the pupil and the shape of the lens.
- Striated/Skeletal Muscle (Incorrect): These are voluntary muscles characterized by transverse striations. They are typically attached to the skeletal system (bones) and are responsible for body movements and locomotion (e.g., biceps, triceps).
- Cardiac Muscle (Incorrect): These are involuntary, striated muscles found exclusively in the walls of the heart. They are responsible for the rhythmic contraction of the heart.
Key Takeaway
Smooth muscles are involuntary, non-striated tissues located in the walls of visceral organs (like the ureters and bronchi) and the iris of the eye, controlling internal movements not under conscious will.