Heart muscle cells (cardiomyocytes) would have the most mitochondria among the cell types listed. This is because the heart requires a significant amount of energy to continuously pump blood throughout the body. Mitochondria are the powerhouses of the cell, producing ATP (adenosine triphosphate), which is essential for cellular energy.
While other cell types like nerve cells (neurons) also have a relatively high number of mitochondria to support their energy needs, heart muscle cells typically have the highest density of mitochondria due to their constant and demanding energy requirements. Fat cells, blood cells, and bone cells have fewer mitochondria compared to heart muscle cells.