Flashcards in chapter 10 - Neural Tissue Deck (34)
events that occur at a chemical synapse
chemical synapses allow the release and reception of chemical neurotransmitters. They are more common than electrical synapses and are usually made up of two parts: the axon terminal and a neurotransmitter receptor region.
the axon terminal is a knob like structure of the pre synaptic neuron. The axon terminal contains many synaptic vesicles containing neurotransmitters.
The electrical current from the pre synaptic neuron dissipates into the synaptic cleft. Therefore chemical synapses prevent nerve impulses being directly transmitted between neurons.
Major types of neurotransmitters
Amino acids (GABA, glutamic acid)
Monoamines (dopamine, histamine, norepinephrine, serotonin)
Neuropeptides (endorphins, enkephalins, substance P)
Gases (nitric oxide)
What is an action potential
An action potential is the basis for a nerve impulse.
It is based on the cell membrane reaching its threshold potential, and is a brief reversal of membrane potential with a change in voltage of 100mv