Neurotransmitters Being Released by a Presynaptic Neuron into the Synapse

question 191

Multiple Choice

Neurotransmitters being released by a presynaptic neuron into the synapse are due to,____.

• A) the neuron being in a refractory period
• B) a large concentration of Na+ ions outside of the presynaptic axon
• C) a high concentration of negative ions inside the neuron
• D) action potentials that have occurred in the presynaptic neuron