Effect of Sympathetic Nervous System on Heart Function

In the human body, the cardiovascular system plays a crucial role in maintaining homeostasis by regulating blood flow and pressure. A key component of this system is the heart, which operates through a coordinated cycle of depolarization and contraction. This cycle is significantly influenced by the autonomic nervous system, which consists of both the sympathetic and parasympathetic branches.

Which of the following statements accurately describes the effect of the sympathetic nervous system on heart function?