What is a key characteristic of cholinergic cells?

Cholinergic cells are specialized neurons that primarily utilize acetylcholine as their neurotransmitter. This neurotransmitter plays a crucial role in transmitting signals in both the peripheral and central nervous systems, particularly in processes such as muscle contraction and various autonomic functions.

The defining feature of cholinergic cells is their reliance on acetylcholine to communicate with other cells, whether it be muscle fibers or other neurons. This characteristic is essential for understanding how these cells function in physiological processes, including memory, attention, and the regulation of voluntary and involuntary movements.

The other options refer to different types of neurotransmitters or functions that do not apply to cholinergic cells; for instance, serotonin is associated with serotonergic cells, and inactive states in the synapse do not pertain to the active role cholinergic cells play in neurotransmission.