BIO310H5 Lecture : lectures #4.docx
Document Summary
One chemical neuron travelling from a presynaptic neuron to a post synaptic neuron-recall channels quicker than carriers. 50% on nervous tissue will have a glutamate neurotransmitter. Inhibitory response, gaba will open channels for chloride (which is negative) so it leads to hyperpolarization of the psotsynaptic neuron. All of them (excitatory and inhibitory) open neuron channles (ionotropic) Acetylcholine and gluatamate (are both metatropic and ionotropic can be fast or slow, depending on the target tissue) Gases are also neurotransmitters (ex. nitric oxide) can pass a membrane very quickly. Table 6-6-all of these attach to proteins and effect ions. (not so importnat) The channel: integral protein (goes from intracellular to extracellular), 5 usbunits. 15 degree twist, that opens the channel (makes it big eneough to aloow sodium and potassium movement. Often while open the channel will desentize and close and then after that the acetylcholine is released.
