Which of the following correctly describes the effects of sympathetic and parasympathetic stimulation on heart rate?

Sympathetic stimulation releases norepinephrine (NE), which binds to beta-1 receptors, increasing heart rate.

Parasympathetic stimulation releases norepinephrine (NE), which binds to beta-1 receptors, increasing heart rate.

Sympathetic stimulation releases norepinephrine (NE), which binds to muscarinic receptors, slowing heart rate.

Parasympathetic stimulation releases acetylcholine (ACh), which binds to the beta-1 receptors, increasing heart rate.