Question

where are smooth muscles located?
they are only in the heart.
they are in the hollow parts of our bodies.
they are attached to our bones.

Explanation:

1. Analyze the first option: Muscles in the heart are cardiac muscles, not smooth muscles, so this option is incorrect.
2. Analyze the second option: Smooth muscles are indeed found in the walls of hollow organs (like the digestive tract, blood vessels, etc.), so this option is correct.
3. Analyze the third option: Muscles attached to bones are skeletal muscles, not smooth muscles, so this option is incorrect.

Answer:

The correct option is: They are in the hollow parts of our bodies.