Some neurons in the vagus nerve have synaptic connections to sinoatrial cells (pacemaker) in the heart. These neurons secrete acetylcholine, which ultimately results in a decreased heart rate. This is an example of
A. neural control.
B. endocrine control.
C. hormonal control.
D. exocrine control.
E. paracrine control.
Answer: A
Anatomy & Physiology
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