Kinesiology 2230A/B Lecture Notes - Lecture 2: Endoplasmic Reticulum, Electrical Synapse, Acetyl Group

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2230A/B
• Professor: Glen Belfry

Document Summary

Motor nerves- stimulus leading to muscle contraction. Bundle of nerves within single motor nerves that are specific to a particular muscle. One nerve can innervate many different muscle fibers. A rapid and sustained depolarization of the nerve membrane: change in polarity from (+) to (-) on the outside of the nerve to the inside of the nerve, aps are short in duration- enables muscle to contract. Membrane must first reach threshold before ap can occur. Rmp: negative charge maintained within the nerve at rest (-70mv) Positive outside is associated with na+, within cell have a significant concentration of k+ Cell membrane much more permeable to k+ than na+ Na will not move into interior of nerve cell without assistance. At rest, need a change in polarity great enough to create an ap (+30mv) depolarization. K+ outside the cell (positive charge) enters the cell making the inside more positive.