Lecture0929final - 3.12 Action potential conduction...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
3.12 Action potential conduction requires both active and passive current flow. When a.p.reaches Point A, passive current flow ahead of the a.p. depolarizes the next patch of axon at point B to threshold..and so on a.p. a.p
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3.12 Action potential conduction requires both active and passive current flow. (Part 2) a.p. refractory
Image of page 2
3.13 Saltatory action potential conduction along a myelinated axon. (Part 1)
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3.13 Saltatory action potential conduction along a myelinated axon. (Part 2)
Image of page 4
3.14 3.14 Speed of action potential conduction is much slower in unmyelinated vs. myelinated axons. In advance of an a.p., passive current instantaneously spreads. Myelin insulates the axonal membrane, reducing leakage of passive current out and reducing membrane capacitance
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3.14 Speed of action potential conduction is much slower in unmyelinated vs. myelinated axons. In unmyelinated axons, channels have to open at every point along the axon. The time taken to open them slows down the a.p. In myelinated axons, channels open only at the nodes and the time Taken for passive current flow to depolarize the node is v. short
Image of page 6
3.14 Speed of action potential conduction in unmyelinated and myelinated axons. (Part 3) Action potentials also travel faster in larger diameter axons because the length constant for passive current flow is longer due to lower electrical resistance
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Recording single channel activity
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern