BISC208 Lecture Notes - Lecture 14: Voltage-Gated Potassium Channel, Resting Potential, Central Nervous System

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Central nervous system (cns)- consists of a brain and spinal cord. Peripheral nervous system (pns) consists of cranial nerves, spinal nerves, and ganglia. Nervous systems have two classes of cells: neurons and glia. Cell body- contains the cell nucleus and other organelles. Dendrites- projections of the cell body with numerous branching extensions that provide a larger surface area for contacts with other neurons. Electrical and chemicals messages from other neurons are received by dendrites and move towards cell body. Axon- extension of the cell body that transmits signals along its length and eventually to neighboring cells. Axon hillock- the part of the axon closest to the cell body and is important in the generation of the electrical signals that travel along an axon. Axon terminals- convey electrical or chemical messages to other cells, such as other neurons or muscle cells. Nerves- parallel bundled axons covered by a protective layer of connective tissue that transmits signals between the pns and cns.

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