The chemicals that bridge the synaptic clefts are called:

A) sympathomimetics
B) receptors
C) neurotransmitters
D) ganglions

C) neurotransmitters
The space between each synapse (called the synaptic cleft) is bridged by chemicals called neurotransmitters. The two primary neurotransmitters in the autonomic nervous system are acetylcholine (ACh) and norepinephrine (NE).