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