Lecture%204 - Lecture 4 Outline Membrane Potentials Graded...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 4 10/5/04 Outline: Membrane Potentials, Graded Potentials, Action Potentials: Generation and Conduction, Synaptic Transmission: pre-synaptic events, post-synaptic events, neurotransmitters Graded Potentials -causes a local response within the cell that occurs at and near the site of the stimulus; not propagated Action Potential -sent over long distances, propagated , sent quickly; means by which a strong enough stimulus is conducted down the axon->axon terminal->release of neurotransmitters Membranes have many channels -can be used to generate electrical potentials -there are selective ion channels i.e. they only select for one specific molecule, such as Na+ selective channels only let Na+ through 1) leak channels-always open, mainly K+ selective (cell has a higher permeability to K+ than to anything else, at rest) - since K+ is the most permeable, it creates a negative membrane potential = polarized (*Dr. Fortes showed a diagram of the Na+, K+ movement in and out of the cell) -Hyperpolarization -increased negative charge inside the cell from taking out positive charge or adding negative charge -Depolarization- decrease the negative charge of the cell (make it more positive)
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
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