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BIO 203 Lecture 10 - February 27th 2007 Inactivation of...

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February 27 th , 2007 Inactivation of neurotransmitters, inactivation of the first signal Can be endocytosed (opposite from exocytosis where the neuron reuptakes the neurotransmitters Action potential goes to the axon, makes the Ca2+ terminals open, calcium enters the cell and depolarizes it Synaptic vesicles fuse with membrane and open Neurotransmitter diffuses across the synaptic cleft and binds to receptor Neurotransmitter will bind to chemically gated receptor and open an ion channel Introduction to the Peripheral Nervous System Structural and functional organization of the nervous system o Central nervous system o Peripheral Brainstem (Pons and medulla, respiratory, blood pressure, breathing) Spinal cord is about 18 inches long, diameter of a pencil, how we move is dependent on this cord Peripheral o Efferent (outgoing) neurons Somatic – skeletal muscle only, acetyl choline neurotransmitter Voluntary motor system, can move your body whenever you want
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