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Muscles

QuestionAnswer
tendon connects bone to muscle, transmits force to move skeleton
skeletal muscle voluntary, striated, responsible for body movement
cardiac muscle involuntary, striated, found only in heart, and pumps blood
smooth muscle involuntary, non-striated, found in walls of organs like stomach and blood vessels
sacromere basic unit of muscle contraction, consists of actin and myosin filaments
sarcoplasmic recticulum organells that stores and releases calcium ions during muscle contraction
calcium lons trigger contraction by allowing actin and myosin to bind
actin filaments thin protein filaments in sarcomere, interacts with myosin to cause contraction
myosin filaments thick protein filaments that pull on actin to shorten muscle
toprpnin a protein on actin that binds calcium and uses tropomyosin to expose binding sites
tropomyosin protein strand covering actins binding sites until calcium activates troponin
adenosine triohosphate maian energy source for muscle contraction and relaxation
endomysium connective tissue surrounding each individual muscle fiber
perimysium connective tissue surrounding a bundle of muscle fibers (fascicle)
myofibril long thread like organelle inside muscle fibers made of repeating sarcomeres
fascicle bundle of muscle fibers wrapped in perimysium
epimysium outer layer of connective tissue covering entire muscle
muscle fiber/cell singe elongated muscle cell contracting to produce movement
muscle fatigue the decline in ability of a muscle to generate force due to overuse or lack of ATP
electromyogram (EMG) a test that measures the electrical activity of muscles during contraction
tetany a sustained muscle contraction caused by rapid repeated nerve impulses
muscles have at least 2 points of attachment
attachment that moves is insertion
attachment that stays stationary is the origin
muscles must cross at least 1 joint
muscles work in opposing pairs
muscle that decreases the angle of the joint is a flexor
Created by: user-1898300
 

 



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