04 - Neurons and Action Potentials.docx

04 - Neurons and Action Potentials.docx - Maddy Banbury |...

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Maddy Banbury | PRE-LECTURE ASSIGNMENT #4 – Neurons and Action Potentials Reading Assignments: Human Physiology: An Integrated Approach 7 th ed. – Chapter 8: Neurons Vocabulary Varicosities: swollen regions along autonomic axons that store and release neurotransmitters Dendrites: the thin, branched processes that receive and transfer incoming info to an integrating region within the neuron axon hillock: region of the axon where it joins the cell body. Often contains the trigger zone. Fast axonal transport: rapid movement of particles along an axon using microtubules and kinesin foot proteins. Slow axonal transport: moving material by axoplasmic flow from the cell body to the axon terminal. Cn only be used for components that are not consumed rapidly by the cell, like enzymes and cytoskeleton proteins. glial cells: surround neurons and provide support for and insulation between them o oligodendrocytes: CNS glial cell that forms myelin around several axons. o Schwann cells: forms myelin around a peripheral neuron axon o satellite cells: glial cell that forms a supportive capsule around nerve bodies in ganglia o astrocytes: glial cells in the CNS that contact both neurons and blood vessels. o Microglia: macrophages in the CNS o ependymal cells: specialized cells that create a selectively permeable epithelial layer (ependymal) that separate conductance: the ease which ions flow through a channel (varies with gating state of the channel and with channel protein isoform) resistance:an opposition to a force, such as the resistance offered by the constriction of peripher al vessels to the blood flow in the circulatory system.
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