01.31 Thursday - Thursday January 18th 2008 I Graded...

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Thursday, January 18 th , 2008 I. Graded Potentials a. Based on the strength of the stimulus b. Why does high sodium outside the vell result in seizures? i. Starts an excitatory graded potential ii. Give him benzodiazepine (= valium) c. Why benzodiazepine? i. It brings down the resting potential ii. Causes a chloride specific channel protein to open up II. Action Potentials a. Frequency modulated b. 3ms is the fastest c. Measured in hertz- cycles per second d. Maximum firings in a second is 333 Hz e. How does an action potential get propagated? i. Depolarizes the next part ii. Salutatory conduction III. Axons: a. Myelin sheath- allow rate to be much faster- grey part i. Get to equal distances faster b. Nodes of Ranvier- between myelin sheath c. Multiple sclorosis = hardening of Myelin Sheath i. Affects transmission of action potentials IV. Synapses: a. How impulses are transferred from one neuron to another b. Types: 1. Axodendritic : 2. Axosomatic : 3. Axoaxonic : Red = pre-synaptic blue = post synaptic
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c. Parts: (axosynaptic) d.
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