PSYB65H3 Chapter Notes - Chapter 4: Fluid Compartments, Extracellular Fluid, Electric Charge
Document Summary
4. 1 searching for electrical activity in the nervous system. Early clues that linked electricity and neuronal activity. Electrical stimulation: passage of an electrical current from the uninsulated tip of an electrode through tissue, resulting in changes in the electrical activity of the tissue. Voltmeter: device that measures the flow and the strength of electrical voltage by recording the difference in electrical potential between two bodies. Electroencephalogram (eeg): graph that records electrical activity from the brain and mainly indicates graded potentials of many neurons. Oscilloscope: device that serves as a sensitive voltmeter by registering changes in voltage over time. Microelectrode: a microscopic insulated wire or a saltwater-filled glass tube whose uninsulated tip is used to stimulate or record from neurons. The intracellular fluid within a neuron and the extracellular fluid surrounding it contain various ions, including na+ (sodium) and. K+ (potassium) positively charged, as the plus signs indicate and negatively charged cl (chloride).
