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How do neurons conduct nerve impulses?

How do neurons conduct nerve impulses?. Neurons conduct nerve impulses through an electrochemical signal called an An action potential is generated by the Ions are M embranes of neurons contain ion channels , which allow passage of ions between the . Neuron at Rest (before impulse).

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How do neurons conduct nerve impulses?

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  1. How do neurons conduct nerve impulses? • Neurons conduct nerve impulses through an electrochemical signal called an • An action potential is generated by the • Ions are • Membranes of neurons contain ion channels, which allow passage of ions between the

  2. Neuron at Rest (before impulse) • At rest, the inside of the neuron is • The membrane is described as

  3. Neuron Depolarization (During a Nerve Impulse) • Stimulation of the neuron, • The inside of the neuron is now • This is called • The adjacent section of membrane allows

  4. Nerve Repolarization(After a Nerve Impulse) • After a short time, • K+ ions continue to exit the neuron, thus • Known as animation

  5. Refractory Period • After an action potential occurs, there is a short time during which the • As a result, Animation - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter44/action_potential_propagation_in_an_unmyelinated_axon.html

  6. All-or Nothing Action Potenitals • Action potentials are • The action potential only occurs if the stimulus causes enough sodium ions to enter the cell thus • If too few Na+ ions enter the cell,

  7. How fast are nerve impulses? • Action potentials can travel along axons at speeds of • Thus, nerve impulses can get from one part of a body to another in

  8. Review of Nerve Impulse – Place the following events in order • The neuron is repolarized • A stimulus reaches the neuron • The neuron enters a refractory period • Na+ channels open allowing Na+ to flood into the neuron • The neuron is depolarized • Na+ channels close while K+ channels open allowing K+ to flow out of the neuron

  9. Transmitting the Impulse Across a Synapse • The end of a neuron where • When the impulse reaches a synapse, it must be transferred to the next neuron. • Problem: • Solution:

  10. Label the Structures of a Synapse • a. • b. • c. • d. • e.

  11. Neurotransmission Process

  12. Neurotransmission Process (Cont) http://highered.mcgraw-hill.com/sites/0072943696/student_view0/chapter8/animation__transmission_across_a_synapse.html

  13. Useful Animations • http://highered.mcgraw-hill.com/sites/0072943696/student_view0/chapter8/animation__the_nerve_impulse.html • http://highered.mcgraw-hill.com/sites/0072943696/student_view0/chapter8/animation__transmission_across_a_synapse.html

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