BIO 102 Lecture Notes - Lecture 8: Endoplasmic Reticulum, Golgi Apparatus, Spinal Cord

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Nervous system has two principal cell types: Neurons (nerve cells) - receive, process and transmit information. A cell membrane covers all 4 parts. Receive information from the environment or another neuron. Conduct electrical signals over distances to a synapse where it meets another cell. Transmit information to other neurons, muscles, or glands. Dendrites - perform the receive information function. Branches provide a large surface area for receiving signals. Dendrites of sensory neurons respond to specific stimuli: Pressure, light, blood ph, sound, odor, body temp. , position of a joint. Dendrites of neurons in the brain and spinal cord respond to chemicals (neurotransmitters( that are released by other neurons. Cell body - processes signals from the dendrites. Electrical signals travel down the dendrites and converge on the neuron"s cell body which integrates the incoming information. If incoming signals are excitatory an action potential is produced. An incoming signal may also be inhibitory. Net excitatory = action potential (electrical impulse)

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