BIOLOGY 101 Lecture Notes - Lecture 7: Neuroglia, Voltage-Gated Potassium Channel, Extracellular Fluid

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Function is to integrate and coordinate the body"s activities. Two major divisions: central nervous system (cns): brain and spinal cord, peripheral nervous system (pns): all of the nervous tissue outside the cns. Composed of two categories of specialized cells: neurons- excitable cells that generate and transmit messages, neuroglial cells- provides structural support, growth factors, and insulating sheaths around axons. Sensory (or afferent) neurons: carry information toward the cns from sensory receptors. Motor (or efferent) neurons: carry information away from the cns to an effector (muscle or gland). Interneurons (or association) neurons: found only in the brain and spinal cord (cns), placed between sensory and motor neurons, integrate and interpret sensory signals, account for more than 99% of the body"s neurons. What is the difference between a nerve and a neuron: sciatic nerve- a whole bunch of neurons, neuron- individual. Dendrites- receive signals from other cells and carry information toward the cell body of a neuron.

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