PSY 2301 Chapter Notes - Chapter 4: Threshold Voltage, Sodium Channel, Volt
Document Summary
Definition: passage of an electrical current from the uninsulated tip of an electrode through tissue, resulting in changes in the electrical activity of the tissue. Movement of ions to create electrical charges intracellular and extracellular fluids of the neuron are filled with various ions like k+ and na + (cations) and negatively charged (anions) like cl- 3 factors influence the movement of anions and cations into and out of cells: diffusion, concentration gradient, and charge, diffusion: Molecules move from places of high concentration to low. Graded potential: small voltage fluctuation in the cell membrane restricted to the vicinity on the axon where ion concentrations change to cause a brief increase (hyperpolarization) or decrease (depolarization) in electrical charge across the cell membrane. Use tea chemical that blocks potassium channels inhibits both hyperpolarization and depolarization. Hyper polarization: is due to an efflux of k+, making the extracellular side of the membrane more positive or an influx of cl-
