Human Anatomy Exam 3 UIowa questions with answers

Human Anatomy Exam 3 UIowa questions |\ |\ |\ |\ |\




with answers
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contractibility - CORRECT ANSWERS ✔✔ability of a muscle |\ |\ |\ |\ |\ |\ |\



to shorten
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excitability - CORRECT ANSWERS ✔✔ability of muscle to
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respond to stimuli |\ |\




extensibility - CORRECT ANSWERS ✔✔ability of a muscle |\ |\ |\ |\ |\ |\ |\ |\



to extend
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elasticity - CORRECT ANSWERS ✔✔ability of a muscle to
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return to its resting length
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all or none law - CORRECT ANSWERS ✔✔individual muscle
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contract as hard as they can or not at all
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functions of muscles - CORRECT ANSWERS ✔✔body
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movement, maintaining posture, regulating elimination of
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materials, heat production
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,epimysium - CORRECT ANSWERS ✔✔CT that surrounds |\ |\ |\ |\ |\ |\ |\



entire muscle |\




perimysium - CORRECT ANSWERS ✔✔CT surrounding |\ |\ |\ |\ |\ |\



fascicle


endomysium - CORRECT ANSWERS ✔✔CT surrounds |\ |\ |\ |\ |\ |\



muscle fiber |\




origin - CORRECT ANSWERS ✔✔muscle tendon that
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attaches to the bone that remains stationary during
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contraction


Insertion - CORRECT ANSWERS ✔✔at the end of tendon, it
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attaches to the end of the bone, moves toward origin
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when muscle contracts
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myofibrils - CORRECT ANSWERS ✔✔cylindrical structures
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extending the entire length of the cell, 80% fiber volume,
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ability to shorten resulting in contraction of muscle fiber,
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think and thin filaments
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A band - CORRECT ANSWERS ✔✔everywhere thick
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filaments are present |\ |\

,H zone/band - CORRECT ANSWERS ✔✔only thick filament,
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no overlap, dark part
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M line - CORRECT ANSWERS ✔✔center of H zone, middle
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of the sarcomere, two Z lines pull toward this
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I band - CORRECT ANSWERS ✔✔only have thin filaments
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Isometric - CORRECT ANSWERS ✔✔length of muscle |\ |\ |\ |\ |\ |\ |\



remains constant |\




Concentric - CORRECT ANSWERS ✔✔length of the muscle |\ |\ |\ |\ |\ |\ |\ |\



gets shorter |\




Eccentric - CORRECT ANSWERS ✔✔length of the muscle |\ |\ |\ |\ |\ |\ |\ |\



gets longer |\




sliding filament theory - CORRECT ANSWERS ✔✔muscles
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shorten by thin and thick filaments sliding past each
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other, filaments increase over lap |\ |\ |\ |\




Troponin - CORRECT ANSWERS ✔✔attached to both actin |\ |\ |\ |\ |\ |\ |\ |\



and tropomyosin, has a binding site for calcium
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, Tropomyosin - CORRECT ANSWERS ✔✔rope like protein, at |\ |\ |\ |\ |\ |\ |\



rest it is in a position to cover binding sites of actin
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agonist - CORRECT ANSWERS ✔✔main muscle that
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performs the movement, biggest muscle in the region,
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prime mover |\




synergist - CORRECT ANSWERS ✔✔help with movement
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but aren't the biggest muscle
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antagonist - CORRECT ANSWERS ✔✔opposite side of the |\ |\ |\ |\ |\ |\ |\ |\



body that performs the other movement
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Fibromyaligia - CORRECT ANSWERS ✔✔chronic muscle |\ |\ |\ |\ |\ |\



pain, unexplainable
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muscular dystrophy - CORRECT ANSWERS ✔✔progressive
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deterioration of muscles and tissue (winged scapulae and |\ |\ |\ |\ |\ |\ |\ |\



scoliosis), results in atrophy of the affected muscle,
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muscle fibers are replaced by fibrous connective and fatty
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tissue, no cure
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Amyotrophic lateral sclerosis (ALS) - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\



✔✔neurodegenerative disease affecting motor neurons; |\ |\ |\ |\ |\



loss of function leads to muscle weakness, atrophy, and
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