The cells in the heart need a constant supply of nutrients / oxygen and to get rid of their waste products ans that why it needs its own special circulatory system.
Functions of authority
Function 1. Formation of the paradigms.
Function 2. Installation of rules.
Function 3. Enforcement of rules.
Function 4. Rewarding the righteous subordinates.
Function 5. Punishment of the sinners.
Function 6. Energizing.
Function 7. Correction of settings