Answer:
Acetylcholine decreases the heart rate of the organism.
Explanation:
Acetylcholine is a neurotransmitter that regulates the natural pacemaker ability of the heart. Acetylcholine is released by the motor nerves to regulate the proper functioning of heart.
Acetylcholine is released by the stimulation of the vagus and parasympathetic nerve on the sinoatrial node. This increases the potassium level and decreases the calcium level, results in the decrease heart rate of the body.
