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Heart muscles are...

Heart muscles are

A

Visceral

B

Smooth

C

Skeletal

D

Cardiac.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Muscle Types**: There are three main types of muscles in vertebrates: skeletal, smooth, and cardiac. Each type has distinct characteristics and functions. 2. **Identifying Heart Muscles**: The muscles that make up the heart are specifically known as cardiac muscles. This is crucial because the heart has a unique structure and function compared to other muscles in the body. 3. **Characteristics of Cardiac Muscle**: Cardiac muscle is involuntary and striated. This means that it operates without conscious control and has a striped appearance under a microscope due to the arrangement of muscle fibers. 4. **Differentiating from Other Muscle Types**: - **Skeletal Muscle**: This type is voluntary and striated, found in the skeleton, and is responsible for movement. - **Smooth Muscle**: This type is involuntary and non-striated, found in the walls of internal organs (visceral muscles), and controls functions such as digestion and blood vessel regulation. 5. **Conclusion**: Since heart muscles are specifically referred to as cardiac muscles (or myocardium), they are distinct from visceral (smooth) and skeletal muscles. Therefore, the correct answer to the question "Heart muscles are" is **cardiac**. ### Final Answer: Heart muscles are **cardiac**. ---
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