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Questions and Answers
What initiates an action potential in muscle contraction?
What initiates an action potential in muscle contraction?
What happens after the action potential reaches the sarcoplasmic reticulum?
What happens after the action potential reaches the sarcoplasmic reticulum?
What role does Ca2+ play in muscle contraction?
What role does Ca2+ play in muscle contraction?
During the power stroke, what occurs with the myosin head?
During the power stroke, what occurs with the myosin head?
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What is required for a strong binding state between myosin and actin?
What is required for a strong binding state between myosin and actin?
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What is the consequence of calcium being pumped out of the sarcoplasm?
What is the consequence of calcium being pumped out of the sarcoplasm?
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Which component is directly responsible for the energy used during the power stroke?
Which component is directly responsible for the energy used during the power stroke?
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Which of the following accurately describes the role of the sarcolemma during muscle contraction?
Which of the following accurately describes the role of the sarcolemma during muscle contraction?
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What is the relationship between muscle speed of action and generated force?
What is the relationship between muscle speed of action and generated force?
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What happens to the capacity for muscle force generation during eccentric contractions?
What happens to the capacity for muscle force generation during eccentric contractions?
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How does the angle of maximal force relate to muscle insertion and load?
How does the angle of maximal force relate to muscle insertion and load?
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Why are eccentric contractions considered stronger?
Why are eccentric contractions considered stronger?
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What occurs when a sarcomere is fully stretched or shortened?
What occurs when a sarcomere is fully stretched or shortened?
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Which type of motor units generate more force?
Which type of motor units generate more force?
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What defines the optimal sarcomere length?
What defines the optimal sarcomere length?
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What role does the load placed on a muscle play in relation to the angle of maximal force?
What role does the load placed on a muscle play in relation to the angle of maximal force?
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What distinguishes Type I muscle fibers from Type II muscle fibers?
What distinguishes Type I muscle fibers from Type II muscle fibers?
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How does the contractile speed of Type IIa fibers compare to Type I fibers?
How does the contractile speed of Type IIa fibers compare to Type I fibers?
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Which muscle fiber type has the highest aerobic capacity?
Which muscle fiber type has the highest aerobic capacity?
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What is the primary method used to determine muscle fiber type?
What is the primary method used to determine muscle fiber type?
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What characteristic is most associated with Type IIx muscle fibers?
What characteristic is most associated with Type IIx muscle fibers?
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Which characteristic best describes Type IIa muscle fibers?
Which characteristic best describes Type IIa muscle fibers?
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Which type of muscle fiber is primarily found in muscles responsible for maintaining posture?
Which type of muscle fiber is primarily found in muscles responsible for maintaining posture?
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What impact does the sarcoplasmic reticulum have on muscle fiber function?
What impact does the sarcoplasmic reticulum have on muscle fiber function?
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What is the primary color associated with Slow Twitch (Type I) fibers in muscle?
What is the primary color associated with Slow Twitch (Type I) fibers in muscle?
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How many fibers per motor neuron are typical for Type IIa muscle fibers?
How many fibers per motor neuron are typical for Type IIa muscle fibers?
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Which muscle fiber type is predominantly found in most skeletal muscles?
Which muscle fiber type is predominantly found in most skeletal muscles?
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Which statement is true regarding the speed at which muscle fibers reach peak tension?
Which statement is true regarding the speed at which muscle fibers reach peak tension?
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What characterizes muscle fibers that predominantly contain a slow form of myosin ATPase?
What characterizes muscle fibers that predominantly contain a slow form of myosin ATPase?
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Which muscle fiber type is associated with a more developed sarcoplasmic reticulum that aids in calcium delivery?
Which muscle fiber type is associated with a more developed sarcoplasmic reticulum that aids in calcium delivery?
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What is true about the motor neurons associated with Type I fibers?
What is true about the motor neurons associated with Type I fibers?
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Which muscle fiber type predominantly contains a fast form of myosin ATPase?
Which muscle fiber type predominantly contains a fast form of myosin ATPase?
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Which muscle fiber type reaches peak tension faster and generates more force compared to others?
Which muscle fiber type reaches peak tension faster and generates more force compared to others?
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How many subtypes does Type II fibers have?
How many subtypes does Type II fibers have?
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What is primarily responsible for the lighter appearance of the H zone in a relaxed sarcomere?
What is primarily responsible for the lighter appearance of the H zone in a relaxed sarcomere?
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Which structure anchors the actin filament at one end in a sarcomere?
Which structure anchors the actin filament at one end in a sarcomere?
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What proteins work together with calcium to initiate muscle contraction?
What proteins work together with calcium to initiate muscle contraction?
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Which of the following correctly defines the structure of myosin filaments?
Which of the following correctly defines the structure of myosin filaments?
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What function does nebulin serve within a sarcomere?
What function does nebulin serve within a sarcomere?
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Which component is considered the backbone of the actin filament?
Which component is considered the backbone of the actin filament?
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What happens to actin filaments during muscle contraction?
What happens to actin filaments during muscle contraction?
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Which protein participates in covering the active sites on actin when the muscle is in a relaxed state?
Which protein participates in covering the active sites on actin when the muscle is in a relaxed state?
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Which of the following statements about myosin heads is true?
Which of the following statements about myosin heads is true?
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What is the primary characteristic of athletes in speed and strength events regarding muscle fibers?
What is the primary characteristic of athletes in speed and strength events regarding muscle fibers?
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After a 6-week endurance training program, what was the percentage change in Type I (ST) fibers?
After a 6-week endurance training program, what was the percentage change in Type I (ST) fibers?
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Which muscle contraction type is described as generating force without a change in muscle length?
Which muscle contraction type is described as generating force without a change in muscle length?
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What factor does NOT influence the amount of force developed by a muscle?
What factor does NOT influence the amount of force developed by a muscle?
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What is a characteristic of Type IIa fibers after a 6-week sprint training program?
What is a characteristic of Type IIa fibers after a 6-week sprint training program?
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Which muscle classification opposes the motion of prime movers?
Which muscle classification opposes the motion of prime movers?
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In which of the following muscle contractions do actin and myosin filaments slide across each other?
In which of the following muscle contractions do actin and myosin filaments slide across each other?
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What type of contraction is characterized by a constant speed and variable resistance throughout the full range of motion?
What type of contraction is characterized by a constant speed and variable resistance throughout the full range of motion?
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Which muscle contraction type produces joint movement and is considered a dynamic action?
Which muscle contraction type produces joint movement and is considered a dynamic action?
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What percentage of ST fibers is found in world champion marathon athletes in the gastrocnemius?
What percentage of ST fibers is found in world champion marathon athletes in the gastrocnemius?
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Which statement is true regarding muscle fibre type in athletes?
Which statement is true regarding muscle fibre type in athletes?
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Which factor contributes to the generation of force during muscle contraction?
Which factor contributes to the generation of force during muscle contraction?
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What is the defining characteristic of eccentric contraction?
What is the defining characteristic of eccentric contraction?
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Which type of contraction is often used in rehabilitation due to its capacity for building strength without significant movement?
Which type of contraction is often used in rehabilitation due to its capacity for building strength without significant movement?
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