No, the heart muscles do not have the same structure as the arm muscles.
The specialized muscle tissues which form the heart are called the cardiac muscles. The cardiac muscle tissues are unique in the sense that they are only present in the heart and nowhere else in the body.
The specialized cells that form the cardiac muscle tissues are called cardiomyocytes.
Cardiomyocytes are also muscle cells and thus like other muscle cells, they rely on actin and myosin for their contractions. The cardiomyocytes have a high number of mitochondria as the heart muscles need a high amount of energy for their functioning.
The cardiac muscle fibers are thick and branched structures, specialized in contracting and pumping the blood.
Purkinje fibers are a kind of specialized cells present along with the cardiac muscles that help in the transmission of electric impulses to the heart and from the heart.
Therefore, the heart muscles do not have the same structure as the arm muscles.
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