KINE 1P90 Lecture 7: Muscle Activation and Motor Control
28 Feb 2018
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Document Summary
For a muscle to contract, it needs a neural impulse. Neural impulses are electrical currents that pass along nerve fibres. We are made of millions of synapses that connect one nerve to the next, and transmits the electrical impulse down to the muscle. Myelin insulates the axon and allows for faster nerve conduction. The electrical signal that travels along the nerve is called an action potential. It carries the potential of an action; the action may or not happen (muscle contraction) Changes across the membrane of sodium and potassium to make the action potential. In other words, the electric charge inside the cell is different than the electric charge outside of the cell (electrically polarized) intracellular fluid (icf) and the extracellular fluid (ecf) The ions responsible for producing the membrane potential are. Passive diffusion of na+ and k+ across the plasma membrane (80%) Active transport of na+ and k+ across the plasma membrane via the na+-k+ atpase (na+-k+ pump) (20%)
