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ch.7 Muscular System

3 types of Muscle Skeletal, Visceral, Cardiac skeletal has 600 muscles 40% of body weight
Excitabiltiy ability to recieve and respond to a stimuslus from the nervous system
Contractility ability to shorten or contract
Contractility has 4 important function movement, posture, joint stability, heat production
Extensibility muscle can be stretched or extended
Elasticity capacity to recoil or return to its orginal shape
3 skeletal muscle attachments direct, indirect: tendons (aponeurosis), fixed end
aponeurosis broad flat sheetlike
tendons thick rope like
name the 2 stimulus for contraction motor neurons, motor unit
motor neurons special nerve cell that stimulates contraction
motor units single motor neuron and all the muscle fibers it stimulates comprise
what are the 3 contractions of the whole muscle muscle tone, insontonic contraction, isometric contraction
Muscle tone (tonus) muscle unit takes turns contracting and relaxing. (continued state of partial contraction that is present in muscles)
Isontonic contraction tension is constant/Same but the length of the muscle changes
Isometric contraction tension in muscle increases but there is little to no movement
name the 3 movements produced by skeletal muscle agonist, synergist, antagonist
agonist prime mover
synergist works with prime mover to cause movement
antagonist muscles that oppse a particular movement
Created by: AshleyRenay



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