Final answer:
The claim that each vesicle released by a nerve contains only one piece of neurotransmitter is false; synaptic vesicles contain roughly 10,000 molecules of neurotransmitter and are essential for neuronal communication.
Step-by-step explanation:
The statement that "Each vesicle released by the nerve contains one piece of neurotransmitter (NT)" is false. Synaptic vesicles, which are found in the axon terminals of neurons, release neurotransmitters into the synaptic cleft to transmit signals between neurons. During neurotransmission, these vesicles release their contents by a process called exocytosis, which is stimulated by the influx of calcium ions (Ca²+).
According to a pseudo-colored image from a scanning electron microscope, each vesicle contains about 10,000 neurotransmitter molecules, demonstrating that they carry a multitude of neurotransmitter molecules, not just one. This process is vital for proper communication between neurons, such as when acetylcholine (ACh) is released from a presynaptic neuron into the synaptic cleft and binds to ACh receptors on the post-synaptic membrane.