Which of the following describes fast synaptic potentials?

Fast synaptic potentials are primarily characterized by their rapid onset and brief duration, making them occur over a shorter time scale compared to other types of synaptic responses. They are mediated by chemically gated channels, specifically ionotropic receptors, which allow for the immediate passage of ions across the neuronal membrane upon binding of neurotransmitters. This results in a rapid change in the postsynaptic membrane potential.

The rapid nature of these potentials is essential for fast neurotransmission, allowing for quick signaling necessary for processes such as reflex actions or immediate responses to stimuli. The involvement of chemically gated channels is crucial because they react directly to neurotransmitter binding, leading to a swift ionic current that can quickly depolarize or hyperpolarize the neuron.