Make up 10 of cells in the brain the rest are glial cells provide support for

Make up 10 of cells in the brain the rest are glial

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Make up 10% of cells in the brain; the rest are glial cells (provide support for the neurons to grow on and around, deliver nutrients, produce myelin to coat axons, clean up waste product, influence info processing and influence generation of new neurons)Myelin – fatty substances produced by certain glial cells that coat the axons of neurons to insulate, protect, and speed up neural impulseNerves – bundle of axons (like copper wires inside plastic cable [myelin]) that travel together throughout the bodyNeural impulseContains charged ions (relatively negative inside cell)When neuron reaches excited state (after being in resting potential/state) by receiving strong stimulation from another cell, inside becomes positive and outside negative as positive cells move through channels surrounding the membraneknown as action potentialWhen action potential reaches end of axon, message is transmitted to another cellAs action potential travels through cell, channels close and positive ions are pumped back out of the cell, causing negative charge inside/positive charge outside (returns to resting potential)Neurons either fire at full strength or not at all (all-or-none)The Synapse/NeurotransmittersSynaptic knobs/axon terminals – rounded areas on the end of the axon terminalsContain synaptic vesicles (saclike structures containing chemicals – fluid-filled sacs)Neurotransmitters are a chemical located in these structures have an effect on the next cellDendrites contain ion channels that have receptor sites that are shaped to fit certain neurotransmitters
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  • Spring '08
  • Nolan
  • Psychology, adrenal glands, endocrine glands

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