Cardiac cells are constantly undergoing contractions and require more energy to perform their functions. Thus, cardiac cells have more mitochondria. In fact, mitochondria occupy 25% of cell space.

Mitochondria in Cardiac Cells
Mitochondria are the powerhouses of the cell, responsible for producing energy in the form of ATP through cellular respiration. In cardiac cells, which make up the heart muscle, there is a high demand for energy due to the constant contraction and relaxation of the heart. Therefore, cardiac cells contain a large number of mitochondria to support this high energy requirement.

Function of Mitochondria in Cardiac Cells
- Mitochondria in cardiac cells play a crucial role in meeting the energy needs of the heart muscle.
- They are involved in generating ATP through oxidative phosphorylation, which is essential for maintaining the contractile function of the heart.
- Additionally, mitochondria in cardiac cells are also involved in other important processes such as calcium signaling and cell survival.

Importance of Mitochondria in Cardiac Cells
- The presence of a large number of mitochondria in cardiac cells ensures that the heart has a constant supply of energy to sustain its pumping action.
- Mitochondria help to maintain the proper functioning of the heart muscle under varying physiological conditions.
- Any disruption in mitochondrial function in cardiac cells can lead to serious consequences such as heart failure.

Conclusion
In conclusion, the high energy demands of cardiac cells make it essential for them to contain a large number of mitochondria. These organelles play a crucial role in meeting the energy needs of the heart and ensuring its proper functioning. Therefore, mitochondria are expected to be present more in cardiac cells compared to other organelles.