Strong stimulation anywhere on the skin of an aplysia excites axons that release: b. serotonin. Therefore , b. serotonin is correct.
In the context of Aplysia, a genus of sea slugs commonly used in neuroscience research, strong stimulation of the skin leads to the release of serotonin.
Aplysia is particularly valuable in studying neural mechanisms due to its relatively simple nervous system, especially in the abdominal ganglion.
When the skin of Aplysia is stimulated, sensory neurons are activated, initiating a cascade of events that ultimately result in the release of neurotransmitters.
In this case, serotonin plays a crucial role as a neurotransmitter.
Serotonin is a monoamine neurotransmitter that functions in both the central and peripheral nervous systems.
It is involved in various physiological processes, including mood regulation and the modulation of sensory information.
The release of serotonin in response to strong skin stimulation contributes to the facilitation of synaptic transmission in the neural circuits associated with the defensive withdrawal reflex in Aplysia.
This reflex is a well-studied example of synaptic plasticity, where the strength of the synaptic connections between neurons is modified in response to external stimuli.