physio hw - 1.Explain the difference between an ionotropic...

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1.Explain the difference between an ionotropic and a metabotropic N T ? 2.What is the difference between an EPSP and an IPSP? Excitatory Postsynaptic Potential (EPSP): a graded depolarization of postsynaptic membrane in response to stimulation by a neurotransmitter chemical. ESPSP can be summated, but they can be transmitted only over short distances; they can stimulate the production of action potentials when threshold level of depolarization is attained. Inhibitor Postsynaptic Potential(IPSP): a hyper polarization of the postsynaptic membrane in response to a particular neurotransmitter chemical, which makes it more difficult for the postsynaptic cell to attain the threshold level of depolarization required to produce action potentials. IPSP is responsible for postsynaptic inhibition. 3.Describe various modalities in which neurotransmitters may stop functioning. 4. What does ACH do in the CNS? Acetylcholine(ACH) is used as an excitatory neurotransmitter by some neurons in the CNS and by somatic motor neurons at the neuromuscular junction.
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