Question:
The muscles in the iris of eye are
The muscles in the iris of eye are
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Ciliary muscles and iris muscles are smooth involuntary muscles controlled by the autonomic nervous system.
Updated On: Jun 12, 2026
- Striated muscles
- Unstriated muscles
- Cardiac muscles
- Skeletal muscles
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The Correct Option is B
Solution and Explanation
Concept:
The iris regulates the amount of light entering the eye by changing the diameter of the pupil.
Its movements are controlled involuntarily.
Step 1: Identify muscles present in iris. The iris contains:
• Circular muscles (sphincter pupillae)
• Radial muscles (dilator pupillae) Both are smooth muscles.
Step 2: Understand smooth muscles. Smooth muscles are:
• Non-striated
• Involuntary
• Controlled by autonomic nervous system
Step 3: Eliminate incorrect options. Striated and skeletal muscles are voluntary. Cardiac muscles occur only in the heart. Hence these options are incorrect.
Step 4: Final conclusion. The iris contains: \[ \boxed{\text{Unstriated (smooth) muscles}} \] Hence option (B) is correct.
Step 1: Identify muscles present in iris. The iris contains:
• Circular muscles (sphincter pupillae)
• Radial muscles (dilator pupillae) Both are smooth muscles.
Step 2: Understand smooth muscles. Smooth muscles are:
• Non-striated
• Involuntary
• Controlled by autonomic nervous system
Step 3: Eliminate incorrect options. Striated and skeletal muscles are voluntary. Cardiac muscles occur only in the heart. Hence these options are incorrect.
Step 4: Final conclusion. The iris contains: \[ \boxed{\text{Unstriated (smooth) muscles}} \] Hence option (B) is correct.
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