The cells that make up cardiac muscle are specialized to do their job by having many? nuclei, mitochondria, lysosomes, or chloroplasts.

The answer is nuclie. Cardiac muscle is an involuntary, striated muscle that is found in the walls and histological foundation of the heart. The cells that constitute cardiac muscle, called cardiomyocytes or myocardiocytes, predominantly contain only one nucleus, although populations with two to four nuclei do exist. Therefore more the cell with nuclie more the cardiac muscle strength.