BISC208 Lecture Notes - Lecture 6: Axon Terminal, Schwann Cell, Nociceptor

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The nervous system consists of the brain, the spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Connected with one another to form networks. Main function to transmit and receive signals to and from different parts of the body. Contribute to both brain and body functions. A human brain contains around 86 billion neurons. Sensory neurons: transmit information collected by body sensors. Motor neurons: transmit information that produces behaviors to a response. Myelin plays a critical role in increasing signal transmission speed. Glial cells provide support and protection for neurons. Nociceptors as (cid:498)pain receptors(cid:499) sense mechanical pressure, temperature, or chemical changes; require a stronger than usual stimulus before sending signal to brain. Action potentials: fast, electrically based signal transmitted by an axon to the axon terminal. Neurons transmit messages through an electrochemical system in response to a stimulus semi permeable plasma membrane.

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