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BMSC207 post midterm Test with Questions Solved 100% Correct
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BMSC207 post midterm Test withQuestions Solved 100% Correct
Phosphocreatine - Answer found in muscle tissue; provides a rapid source of high-
energy ATP for muscle contraction
anaerobic metabolism - Answer metabolism in the absence of oxygen
Oxidative (aerobic) metabolism - Answer needs oxygen to produce energy, very efficient
central fatigue - Answer feeling of tiredness and the desire to cease activity
peripheral fatigue - Answer problems with the neuromuscular junction between
the motor nerve and muscle or problems within the muscle cell at the level of the
sarcomere
Type 1 - Answer Slow oxidative fiber
Type 2A - Answer Fast- oxidative glycolytic fiber
Type 2X - Answer Fast Glycolytic fiber
,length-tension relationship - Answer The resting length of a muscle and the tension
the muscle can produce at this resting length.
single twitch - Answer muscle relaxes completely between stimuli
Summation - Answer stimuli closer together do not allow muscle to relax fully
Tetanus - Answer a sustained muscular contraction resulting from a rapid series of
nerve impulses
unfused tetanus - Answer type of wave summation with partial relaxation observed
between twitches
fused tetanus - Answer when stimulus frequency is so high that no muscle
relaxation takes place between stimuli
motor unit - Answer A motor neuron and all of the muscle fibers it innervates
motor neuron pool - Answer all the motor neurons that innervate a single muscle
size principle - Answer As stimulus intensity increases, motor units leads with larger
fibers are recruited
Interneurons - Answer Upper motor neuron
asynchronous recruitment - Answer The nervous system modulates the firing rates of
the motor neurons so that different motor units take turns maintaining muscle tension.
, The alternation of active motor units allows some of the motor units to rest
between contractions, preventing fatigue.
skeletal muscle - Answer striated, voluntary, multinucleated
cardiac muscle - Answer striated, involuntary, uninucleated
smooth muscle - Answer non-striated, involuntary, uninucleated
origin - Answer Closest to the trunk or to more stationary bone
Insertion - Answer More distal or more mobile attachment
Antagonistic muscle groups - Answer flexor-extensor pairs
Flexor - Answer Brings bones together
Extensor - Answer Moves bones away
muscle fiber - Answer a single muscle cell
Sarcolemma - Answer plasma membrane of a muscle fiber
Sarcoplasm - Answer cytoplasm of a muscle fiber
sarcoplasmic reticulum - Answer Organelle of the muscle fiber that stores calcium.
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