BIOL 460 Chapter Notes - Chapter 7: Connexin, Internal Resistance, Neurotransmitter
20 Sep 2016
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Conduction of nerve impulses cable properties high internal resistance and prevent leaking action potential at one location serves as the stimulus for the next region. As stimulus potential increases, more axons are activated (called recruitment) conduction in a myelinated neuron: saltatory conduction can jump from node to node increase diameter, increase speed of action potential. Myelination also increases speed synapse: functional connection between neuron and another cell: cns: neuron to neuron, pns: neuron to another neuron or another effector cell. Neurons can signal to dendrites, cell body, or axon of another neuron: axodendritic: from axon to dendrite axosomatic: axon to cell body axoaxonic: axon to axon. Synaptic transfer can be electrical or chemical: electrical synapses. Connexin: 6 proteins: allow ions and molecules to pass, chemical synapse. Contain synaptic vesicles: docked to plasma membrane by snare proteins. Contains voltage gated ion channels and calcium gated channels: action potential opens calcium gates, calcium will diffuse down its gradient into cytoplasm of bouton.
