BISC 101 Lecture Notes - Lecture 19: Resting Potential, Axon Hillock, Peripheral Nervous System
20 Jul 2015
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Bisc 101 lecture 18 neurons, synapses and signaling. Neuron organization: neuron organization and structure reflect function in information transfer, nervous systems process information in three stages, sensory input. Motor output leaves the brain or ganglia via motor neurons, which trigger muscle or gland activity. The pns brings information into and out of the cns. Some astrocytes respond to activity in neighboring neurons by facilitating information transfer at those neuron"s synapses. By inducing the formation of tight junctions between capillary cells, astrocytes help form the blood brain barrier. Blood brain barrier: restricts the passage of substances into the. Cns: oligodendrocytes (in the cns) and schwann cell (in the pns): glia that form myelin sheaths around the axons of vertebrate neurons. These sheaths provide electrical insulation of the axon. Voltage-gated channels: voltage-gated ion channels: respond to a change in membrane potential, therefore, the opening or closing of these ion channels occurs when the membrane potential passes a particular level.
