week_3_neurons_are_electric_1_3

week_3_neurons_are_electric_1_3 - Neurons are Electric:...

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HD 220 Fall 2006 1 Temple, 2006 1 Neurons are Electric: Neurons at Rest Week 3, Lecture 1 Temple, 2006 2 Plan for Today • KEY CONCEPT: – Movement of charged chemicals creates electricity • Electricity in a resting neuron – Resting Potential • Graded Potentials • Electricity in an active neuron – The Action Potential Temple, 2006 3 Electricity •E lec t r i c i ty – Flow of electrons from high charge to low
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HD 220 Fall 2006 2 Temple, 2006 4 • Early electrical stimulation studies –18 th century • Galvani saw that frogs legs twitched when stimulated with electricity –M id 19 th century • Number of scientists relationship between stimulation and movement and behavior – Modern stimulation studies • Stimulate neurons electrically they signal Temple, 2006 5 Galvani’s Frogs Temple, 2006 6
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HD 220 Fall 2006 3 Temple, 2006 7 The Giant Axon of the Squid 1 mm Temple, 2006 8 Temple, 2006 9 Measuring Voltage
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HD 220 Fall 2006 4 Temple, 2006 10 Plan for Today • KEY CONCEPT: – Movement of charged chemicals creates electricity • Electricity in a resting neuron – Resting Potential • Graded Potentials • Electricity in an active neuron – The Action Potential Temple, 2006 11 • KEY CONCEPT – Electricity in neurons is caused by movement of charged ions •I o n s – Charged chemicals that are dissolve in water – Cations • Positive charged ions – Sodium (Na +) – Potassium (K +) – Calcium (Ca ++) – Anions • Negative charged ions – Chloride (Cl - ) Temple, 2006 12
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week_3_neurons_are_electric_1_3 - Neurons are Electric:...

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