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Mrs Eastham

contractility ability to shorten w/ force
excitability ability to respond to stimulus
extensibility ability to be stretched
elasticity ability to recoil after being stretched
epimysium connective tissue sheath that surrounds skeletal muscle
fascia connective tissue that is outside the epimysium that separates muscles
what do muscles do that are essential to the body's maintenance? produce heat
fasciculi numerous visible bundles of muscle
perimysium loose connective tissue that surrounds the fasciculi
what are fasciculi composed of? single muscle cells called muscle fibers
epomysium surrounds each muscle fiber
myofibrils threadlike structure that extends from one end of the fiber to the other
actin myofilaments thin myofilaments(looks like pearls twisted together)
myosin myofilaments thick myofilaments(looks like mini golf clubs)
sarcomeres join end to end to form myofibril
what is on each side of the Z line? I bands: which consists of actin
what does the H zone consist of? myosin ONLY
What is the charge difference between membranes called? resting membrane potential
what is action potential? the reverse act to stimulus
motor neurons nerve cells that carry action potential to skeletal muscle fibers
neuromusclular junction axons that branch into the muscle and connect
motor unit single motor neuron and all skeletal muscle innervates
what is the name of the two muscles on the arm bicep and tricep
what is the major muscle in your leg calve muscle
actin and myosin myofilaments slide past one another muscle contraction
sliding filament mechanism sliding of actin and myosin
H and I bands shorten but which one doesnt A band
muscle twitch a contraction
threshold muscle fiber stimulus
all or none response maximum contraction
lag phase time between stimulus and contraction
contraction phase time of the contraction
relaxation phase time when muscle relaxes
tetany where muscles stay contracted
recruitment the increase in number of motor units
atp adenosine triphosphate
atp is produced where mitochondria
atp is what? short-lived and unstable
creatine phosphate storeable energy
anaerobic respiration without oxygen
aerobic respiration with oxygen
muscle fatigue results when atp is used faster than it can be reproduced in contraction
isometric contraction the amount of tension increases
isotonic conrtaction the tension is constant but the length of the muscle changes during contraction
muscle tone constant tension produced by muscles
fast-twitch fibers contract quickly and fatigue quickly
slow-twitch contract slowly and don't fatigue
origin stationary end of muscle
insertion the end of the muscle undergoing the most movement
Created by: living_old_man