BIO203H5 Study Guide - Final Guide: Central Nervous System, Electrochemical Gradient, Squid Giant Axon
Document Summary
Sensory receptors in the skin, eyes, ears, and nose transmit streams of data about the external environment. In vertebrates, the sensory neuron sends the information to neurons in the spinal cord or brain via nerves. In summary, sensory information from receptors in the pns is sent to the cns, where it is processed. Then a response is transmitted back to appropriate parts of the body. Potassium and sodium leakchannels (more potassium than sodium channels)na+- k+- atpase pump resting potential: high intracellular concentration of k+ and proteins and low intracellular concentration of na+ and. An introduction to membrane potentials: a difference of electrical charge between any two points creates a difference in electrical potential, or a voltage. In neurons, membrane potentials are typically about 70 80 mv: membrane potentials are always expressed as inside-relative-to-outside. Electrical potential, currents, and gradients: when a membrane potential exists, the ions on both sides of the membrane have potential energy.
