Cellular cascade also induces gene expression. Protein synthesis results in long-term structural changes at synapse. Unimodal association areas, multimodal association areas. Lesion impairs empathy and results in asocial behavior.
Myofibrils contain two types of filaments.
AP induces release of acetylcholine in synaptic cleft. ACh binds to ligand-gated receptors on muscle membrane and induces depolarization. The muscle cell generates an AP that travels along the muscle fiber and induces contraction. APs always produce muscle contraction. Inhibitory interneurons prevent contraction of the antagonist muscles.