Which statement is NOT true of synapses?
A)Synaptic transmission is only one way.
B)The presynaptic neuron releases the neurotransmitter.
C)The postsynaptic neuron contains an inactivator.
D)The inactivator may send the impulse back across the synapse if necessary.

Question

Quizplus · Accepted Answer

The statement "The inactivator may send the impulse back across the synapse if necessary" is not true. The inactivator (or enzyme) breaks down the neurotransmitter in the synaptic cleft to terminate the signal, but it does not send the impulse back across the synapse. Synaptic transmission is typically one way, from the presynaptic neuron to the postsynaptic neuron. The presynaptic neuron releases the neurotransmitter, which binds to receptors on the postsynaptic neuron to initiate a response. The postsynaptic neuron may have proteins that inactivate the neurotransmitter or reuptake it for recycling.

Which Statement Is NOT True of Synapses