PSY BEH 11A Lecture Notes - Lecture 11: University Of Manchester, Multiple Sclerosis, Resting Potential
23 Oct 2016
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Sodium pores are sealed, closed, under normal circumstances: sodium ions (na+) have a positive charge, the inside of the cell has a negative charge. Some trigger causes the gates to open up, and sodium ions rush in: depolarization to +40 mv. Once the sodium is inside the cell, you have to physically pump it out using time and energy: potassium (k+) ions flows out of the cell. Carrying a positive charge outside of the cell, recharging the charge very quickly to a little beyond its normal resting potential (-70 mv) When stimulated, neurons fire impulses called action potentials: action potential brief electrical charge that travels down the axon. Neurons are bathed in liquid, and this liquid is rich in ions. Ions atoms that carry an electrical charge (+/-) The liquid outside the axon has more positively charged ions, and the solution inside the axon has more negatively charged ions: this state is called the resting potential.
