True: At a chemical synapse, the release of neurotransmitters occurs in response to a graded depolarization of the synaptic terminal.
A neuron is the basic unit of the nervous system. Neurons in the nervous system are connected through a junction called synapses. The neurons communicate through the release of chemicals, called neurotransmitters, into the synapses.
A presynaptic neuron is activated by a signal that triggers the resting potential of this nerve. The presynaptic nerve then carries the action potential. Neurotransmitters are the chemicals that carry action potential through the synaptic terminals and get released into the synapses.
When action potentials are carried through the axon at the synaptic terminal, it results in the depolarization of these terminals. Depolarization opens the ion channels in the synaptic vesicles. Ions like calcium ions, then release the neurotransmitter from the vesicles into the synapses. Released neurotransmitters then bind to receptors of the postsynaptic nerve cell and release the action potentials. Action potentials are then carried by axons and the same process continues. The inactivated neurotransmitters are returned to the presynaptic vesicle.
Therefore, we can now say that at a chemical synapse, the release of neurotransmitters occurs in response to a graded depolarization of the synaptic terminal.
To know more about neurotransmitters, refer to the following link:
https://brainly.com/question/26387085
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