Which of the following statements distinguishes excitatory chemical sy

1.	Which of the following statements distinguishes excitatory chemical synapses in the brain from the neuromuscular junction?
Answer» Answer: Temporal summation and spatial summation onto the postsynaptic cell increase the likelihood that a postsynaptic. action potential will be evoked. In contrast to other neuronal synapses, the individual EPSPs (or EPPs) at the neuromuscular junction are normally much larger than is required to evoke an action potential, and so temporal summation does not increase the probability of firing (although high-frequency firing of the motor neuron does lead to summation of twitches and to tetanization). All the other features listed are shared by the neuromuscular junction and excitatory chemical synapses in the brain.

Which of the following statements distinguishes excitatory chemical synapses in the brain from the neuromuscular junction?

Answer»

Answer: Temporal summation and spatial summation onto the postsynaptic cell increase the likelihood that a postsynaptic. action potential will be evoked.

In contrast to other neuronal synapses, the individual EPSPs (or
EPPs) at the neuromuscular junction are normally much larger than is
required to evoke an action potential, and so temporal summation does
not increase the probability of firing (although high-frequency firing of
the motor neuron does lead to summation of twitches and to tetanization). All the other features listed are shared by the neuromuscular
junction and excitatory chemical synapses in the brain.

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