BISC276 Chapter Notes - Chapter 8.1: Central Nervous System, Peripheral Nervous System, Action Potential

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Crash course in human anatomy and physiology https://www. youtube. com/watch?v=qpix_x-9t7e https://www. youtube. com/watch?v=ozg8m_lda1m https://www. youtube. com/watch?v=vitfvnvriiy. Infinitely more complex and precise than endocrine system. Electrochemical nerve impulses to transmit information within cells. Peripheral nervous system (pns) o o o: sensory or afferent nervous system (sense organs) Brings information to the cns (afferent = incoming: motor or efferent nervous system (muscles) Carry out commands of cns (efferent = outgoing) The nervous system is a vast interconnected network of nerve cells (called neurons) Supported by glial cells (50% of brain mass) Transmit information long distances (up to 3 ft. ) Transfer information to other neurons, usually using chemical signals called. Axon: carries the nerve impulse, often long distances. Are nerves electrical wires? like for electricity: o o o o o o. Nerve impulse is not electricity because it is. Opposite charges attract; like charges repel each other. Separating positive charges from negative charges requires energy. Both represent potential energy that can be used to perform cellular work.

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