BIOL 101 Lecture 15: BIO 101 Nervous System

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2 Dec 2017
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Output: conscious : skeletal/muscles unconscious: smooth/cardiac/ gland secretion. Cnidaria ( sea anemones,jellyfish,coral) - nerve net. Vertebrates-dorsal nerve cord *protected by spinal column *evolution of a more complex brain. Nervous system ( all multicellular animals *except sponges. All nerve cells have same basic structure. Cells that carry electrical signal: stimulus *pain, dendrites, cell body, axon, next neuron. Interneurons *brain/spinal cord *process senses and coordinate response. ( a neuron may have 100s-1000s of dendrites. Sends signal to another neuron or effector cell ( muscle cell ) Nervous system made up of 2 types of cells are neurons and glial cells. Myelin not completely formed around all of their axons. Communication between brain and body is disrupted. Through tiny electrical impulses called action potentials. Action potential is initiated by opening of large number of sodium ion channels. Axon terminals release vesicle contents to interstitial fluid. Two neurons meet at the synapse: membrane potential i)

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