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Unstriated muscles in the vertebrates ar...

Unstriated muscles in the vertebrates are also called

A

Cardiac muscles

B

Skeletal muscles

C

Tonal muscles

D

Visceral or smooth muscles

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**Step-by-Step Solution:** 1. **Understanding Muscle Types**: In vertebrates, muscles can be categorized into three main types: striated (skeletal), cardiac, and unstriated (smooth). 2. **Identifying Unstriated Muscles**: Unstriated muscles are also known as involuntary muscles. This means that their actions are not under conscious control. 3. **Differentiating Muscle Types**: - **Cardiac Muscles**: These are striated muscles found in the heart and are also involuntary. - **Skeletal Muscles**: These are striated muscles attached to bones, and their functions are voluntary, meaning they are controlled consciously. - **Unstriated Muscles**: These are also referred to as smooth muscles or visceral muscles. They do not have the striations (stripes) that are characteristic of skeletal muscles. 4. **Examples of Unstriated Muscles**: Smooth muscles are found in various organs such as the walls of the stomach, esophagus, bronchi, and the iris of the eye. 5. **Conclusion**: Based on the definitions and examples, unstriated muscles in vertebrates are commonly referred to as **visceral muscles** or **smooth muscles**. **Final Answer**: Unstriated muscles in vertebrates are also called **visceral muscles** or **smooth muscles**. ---
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