Junction between axon and adjacent neuron is a synapse 2. Action potentials cause the release of neurotransmitters when they reach the end of an axon a. These neurotransmitters are stored in vesicles at the tip of axons 4. When neurotransmitters reach the dendritic receptors on the adjacent neuron, they cause changes in the receptor's plasma membrane, resulting in an action potential 5. Many of these have subtly different effects on the post-synaptic neuron, or may only be found in certain parts of the nervous system 6.
Caffeine counteracts the effects of inhibitory neurons i.
Evolution of the nervous system A. Remarkable uniformity in structure and function of neurons throughout the animal kingdom 1. However, there is tremendous diversity in how nervous systems are organized B. Simplest type 1. Found in Hydra , a cnidarian 3. This allows coordination of swimming, which is a fairly complicated task 4. However, there are radial nerves in each arm and a ring of nervous tissue in the central disk b.