BSC 1086C Chapter Notes - Chapter 11: Muscle Contraction, Mylohyoid Muscle, Supinator Muscle
Document Summary
Skeletal muscles cause movements by exerting force on tendons, which pull on bones or other structures. Most muscles cross at least one joint. Usually attached to articulating bones that form the joint. Articulating bones usually do not move equally in response to contraction. Muscle contraction -> moves one articulating bone. Two articulating bones do not move equally in response to contraction. One remains stationary or near original position. 1. muscles stability that bone by contracting and pulling in opposite direction. Origin muscle tendon attachment to stationary bone. Insertion - muscle tendon attachment to movable bone. Belly portion of muscle between tendons. Muscles that move a body part often do not cover the moving part. Lever rigid structure that can move around fixed point, which is the fulcrum (f) Lever is acted at 2 different points by 2 different forces. Typically weight of body part that is moved or some resistance.
