Chapter 10 - Nerves PART II
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17 terms
Terms | Definitions |
|---|---|
 Hyperpolarized | membrane potential becomes more negative, |
| Depolarized | membrane potential becomes less negative, |
| Graded (or proportional) | intensity of stimulation reaching thershold potential |
| Action Potential | reaching threshold potential results in a nerve impulse |
| Absolute Refractory Period | Time when threshold stimulus does not start another action potential |
| Relative Refractory Period | Time when stronger threshold stimulus can start another action potential |
| Synaptic transmission | where released neurotransmitters cross synaptic cleft and react with receptors in postynaptic neuron membrane |
| Open & Close Ion Channels | some neurotransmitters |
| Excitatory Postsynaptic Potential | depolarizes membrane of postsynaptic neuron - action potential becomes more likely |
| Inhibitory Postsynaptic Potential | hyperpolarizes membrane of postsynaptic neuron - action potential becomes less likely |
| Summation | When EPSP and IPSP are added together |
| Greater AP | More EPSPs lead to greater probability of AP |
| Neuropeptides | act as neurotransmitters and are synthesized by the neurosn in brain & spinal chord |
| EX of neuropeptides | Enkephalins, Beta endorphin, Substance P |
| Neuronal Pools | Interneurons working together to perform common function (excite or inhibit) |
| Convergence | Various sensory receptors - can allow for summation of impulses |
| Divergence | Branching axon - stimulation of many neurons ultimately |
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