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Anatomy1234
Mrs Eastham
Question | Answer |
---|---|
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 |