Cardiac muscle fibers are........

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(D) Cardiac muscle fibers exhibit the following characteristics:$1$. They are $Involuntary$ in nature,meaning they are not under conscious control.$2$

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All of the above

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(D) Cardiac muscle fibers exhibit the following characteristics:$1$. They are $Involuntary$ in nature,meaning they are not under conscious control.$2$. They are $Striated$ due to the presence of alternating light and dark bands (sarcomeres).$3$. They are $Fatigue-resistant$ because they contain a high density of mitochondria and myoglobin to support continuous,rhythmic contraction throughout life.Therefore,all the given options are correct.

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