BIOL 141 Lecture Notes - Lecture 5: Central Nervous System, Homeostasis, Peripheral Nervous System

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Regulation means maintaining a stable internal environment (homeostasis) Two systems dedicated to this process o o. Nervous > electrical signals and chemical messages ( fast, neurotransmitters) Specialized cells called neurons make up nervous tissue. Cells can respond to stimuli from environment or other cells. Results in an electrical signal (action poteintal ) Major evolution pressure to maintain this function as a form of: conductivity it originated. Neurons can propagate an electrical signal over a distance from where. Neurons can translate an electrical signal (stimulus) into a chemical: secretion signal. Dendrites: short, thick extensions off the cell body. Site for receiving signals from other neurons o. Axon: extension away from the cell body o. Synapse: site of communication between two neurons o o. Some can be myelinated to improve conductivity and help. Multipolar: cell body is up more closer to the dendrites. Bipolar neurons: cell body is more centrally located. Unipolar: cell body is more shifted to once side.

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