At the terminal end of the axon is a branched structure with ends called synaptic knobs. From this structure chemical signals can be sent to neighboring neurons. Transmission of nerve impulse along the axon
When an action potential reaches the axon terminal of a motor neuron, vesicles carrying neurotransmitters (mostly acetylcholine) are exocytosed and the contents are released into the neuromuscular junction.These neurotransmitters bind to receptors on the postsynaptic membrane and lead to its depolarization.he small depolarization associated with the release of acetylcholine from one synaptic vesicle is called a miniature end-plate potential (MEPP). MEPPs are additive and lead to a greater depolarization of the postsynaptic membrane and become end plate potentials (EPPs).
The Golgi apparatus is abundant in secretory cells, such as cells of the pancreas. BACK TO CELL IMAGE Golgi Vesicle: A membrane-bound body that forms by budding from the Golgi apparatus. It contains proteins (glycoproteins), such as digestive enzymes, and migrates to the cell (plasma) membrane.Golgi vesicles fuse with the cell membrane and discharge their contents into the exterior of the cell through a process called exocytosis.inocytotic Vesicle: A membrane-bound vacuole formed by a specific type of endocytosis called pinocytosis. The plasma membrane invaginates (pinches inwardly) to form a vesicle that detaches and moves into the cytoplasm.