presynaptic neuron

Neurotransmitters and Their Types

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A chemical substance present in neuron. Transmits nerve impulse from one to another neuron. Thus also called a mediator for impulse transmission. Transmission occurs through synapse. Discovered first by Otto Loewi in 1921. Was an Austrian scientist who practically came out with this discovery. Criteria for Neurotransmitters Various substances are categorized as neurotransmitters. Following criteria … Read more

Differences between neurotransmitters and neuromodulators

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S.N Neurotransmitters S.N Neuromodulators 1. Available in axon terminals. 1. Available in all parts of the body. 2. Are generally packed in small synaptic vesicles. 2. Are packed in large synaptic vesicles. 3. Nerve impulse propagates through synapse. 3. Synaptic transmission is modified and regulated. 4. Change the electric potential- depolarization or repolarization while functioning. … Read more