BIOL273 Lecture Notes - Efferent Nerve Fiber, Chemical Synapse, Motor System

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Central nervous system: brain and spinal cord. Job is to receive info from sensory neurons: sensory info (external (weather)and internal (blood glucose level) Takes info and evaluates it and formulate response. Response go to efferent neurons > effector organs: skeletal muscles, visceral organs (organs of digestion, the heart - blood vessels, smooth muscle, endocrine tissues) Afferent: afferent neurons carry signals to cns. Somatic motor neurons: carry signals to effector organ -- skeletal muscles only. Autonomic neurons/division: carry signals to all effectors that are not skeletal muscles. Sympathetic: if bring signal to heart, heart accelerates and beats faster, stronger, blood flows faster, speed up respiration. Parasympathetic: when at rest, carries opposite signals to sympathetic signals(slow down heart beat) Balance b/t two opposing signals are important. In both branches of autonomic division, two neurons carry signal from the. They are joined by a chemical synapse grouped in cluster --- "ganglia" Preganglionic neuron: signal carried from cns to ganglion.

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