Difficulty: Medium

Average Score: 72%

Which of the following describes one difference between skeletal and cardiac muscles?

Rationale

Cardiac muscles are involuntary, whereas skeletal muscles are voluntary.

Cardiac muscles function autonomously and are controlled by the autonomic nervous system, making them involuntary. In contrast, skeletal muscles are under conscious control, allowing for voluntary movement.

A (Cardiac muscles are involuntary, whereas skeletal muscles are voluntary) CORRECT

This statement accurately reflects the fundamental difference in control between the two muscle types. Cardiac muscle contractions occur without conscious thought, while skeletal muscles are consciously controlled, enabling intentional movement.

B (Skeletal muscles are not autorhythmic, whereas cardiac muscles are) YOUR ANSWER

While it is true that cardiac muscles are autorhythmic, skeletal muscles are not defined by their autorhythmic nature; they contract only in response to neural stimulation. Thus, this statement does not adequately highlight a difference specific to the nature of skeletal muscle control compared to cardiac muscle.

C (Skeletal muscles are found in the limbs, whereas cardiac muscles are found in the heart) YOUR ANSWER

This statement describes the locations of the two muscle types rather than a functional difference between them. While it accurately identifies where each type is found, it does not address the differences in control or function, which is the primary focus of the question.

D (Skeletal muscles are not autorhythmic) YOUR ANSWER

While this statement is correct, it does not properly illustrate a comparative difference between skeletal and cardiac muscles. It simply states a characteristic of skeletal muscles without contrasting it against the autorhythmic property of cardiac muscles, missing the broader context of involuntary vs. voluntary control.

Conclusion

The distinction between cardiac and skeletal muscles lies primarily in their control mechanisms. Cardiac muscles operate involuntarily, governed by the autonomic nervous system, while skeletal muscles are consciously controlled for voluntary movement. Understanding this difference is crucial for comprehending how these muscle types function within the body.

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