Physiology LE 1: Muscle Physiology II
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Questions and Answers

What is the type of summation that occurs when multiple motor units are recruited?

  • Spatial Summation (correct)
  • Size Principle
  • High Frequency Stimulation
  • Temporal Summation

    • What is the result of High Frequency Stimulation without complete relaxation?

  • Tension becomes static
  • Tension continues to increase (correct)
  • Tension remains constant
  • Tension decreases

    • What happens to calcium ions during High Frequency Stimulation?

  • Calcium ions are released from the SR
  • All calcium ions return to the SR
  • Some calcium ions return to the SR (correct)
  • No calcium ions return to the SR

    • What is the order in which motor units are recruited according to the Size Principle?

    <p>Smallest fibers to largest fibers</p> Signup and view all the answers

    What is the result of Very High Frequency of Stimulation?

    <p>Maximum tension + Fusion of twitches = Complete Tetanus</p> Signup and view all the answers

    What is the term for the process of recruiting multiple motor units?

    <p>Spatial Summation</p> Signup and view all the answers

    What is the term for the fusion of twitches that results in a smooth, sustained contraction?

    <p>Tetanus</p> Signup and view all the answers

    What is the principle that dictates the order of motor unit recruitment?

    <p>Size Principle</p> Signup and view all the answers

    What happens when a muscle is stretched?

    <p>It becomes more tense</p> Signup and view all the answers

    What occurs when Ca2+ is reabsorbed too quickly?

    <p>Less time for actin-myosin interaction</p> Signup and view all the answers

    What happens when the muscle is stimulated faster?

    <p>Less calcium is reabsorbed</p> Signup and view all the answers

    What is the result of more actin-myosin interactions?

    <p>More muscle contraction</p> Signup and view all the answers

    What happens to tension when the muscle is stimulated faster?

    <p>It increases</p> Signup and view all the answers

    What happens to calcium when the muscle is stimulated faster?

    <p>Less calcium is stored</p> Signup and view all the answers

    What is the ultimate result of increasing the frequency of electrical stimulation?

    <p>Muscle contraction</p> Signup and view all the answers

    What happens when the stimulation stops?

    <p>Tension drops</p> Signup and view all the answers

    What happens when motor units are stimulated asynchronously?

    <p>Smaller, sustained contraction and prevention of muscle fatigue occur</p> Signup and view all the answers

    What is the function of titin in muscle contraction?

    <p>To anchor myosin to Z-disc</p> Signup and view all the answers

    What type of contraction occurs when a muscle contracts but does not change in length?

    <p>Isometric contraction</p> Signup and view all the answers

    Which muscle is capable of producing a long duration of isometric exercise?

    <p>Soleus muscle</p> Signup and view all the answers

    What happens when an object is too heavy and you need to stimulate all neurons?

    <p>You will get tired easily</p> Signup and view all the answers

    What is the purpose of cross-bridges in muscle contraction?

    <p>To develop tension without changing muscle length</p> Signup and view all the answers

    What is an example of an isometric contraction in daily life?

    <p>Sitting upright</p> Signup and view all the answers

    What type of fibers take a while to contract and tire out?

    <p>Larger fibers</p> Signup and view all the answers

    What is the primary function of an agonist muscle?

    <p>To provide the majority of force for the movement</p> Signup and view all the answers

    What happens when the afterload increases?

    <p>Muscle contraction becomes isometric</p> Signup and view all the answers

    What type of contraction occurs when there is a change in the length of the muscle?

    <p>Isotonic</p> Signup and view all the answers

    What is the role of the antagonist muscle?

    <p>To resist the action of the agonist</p> Signup and view all the answers

    What is the sequence of muscle contractions in daily life?

    <p>Isometric - Isotonic - Isometric</p> Signup and view all the answers

    What type of contraction occurs when there is no change in the length of the muscle?

    <p>Isometric</p> Signup and view all the answers

    What is the term used to describe the load that the muscle must overcome to contract?

    <p>Afterload</p> Signup and view all the answers

    What happens to the muscle contraction as the object becomes heavier?

    <p>Isometric contraction increases</p> Signup and view all the answers

    What is the main reason why active tension accurately measures the contractile force of the muscle?

    <p>Actin and myosin binding happens</p> Signup and view all the answers

    What is the effect of increasing the afterload on the velocity of muscle contraction?

    <p>It decreases the velocity</p> Signup and view all the answers

    What is the type of muscle contraction that occurs when the load is maximal and the muscle does not shorten?

    <p>Isometric contraction</p> Signup and view all the answers

    What is the relationship between the afterload and the velocity of muscle contraction?

    <p>Inversely proportional</p> Signup and view all the answers

    Which type of muscle contraction occurs when the muscle shortens and the load is low?

    <p>Concentric contraction</p> Signup and view all the answers

    What is the main difference between a 5kg and a 20kg dumbbell in terms of muscle contraction?

    <p>The 5kg dumbbell is lighter and can be lifted faster</p> Signup and view all the answers

    What is the location of isometric contraction on the force-velocity graph?

    <p>On the x-axis</p> Signup and view all the answers

    What is the type of muscle contraction that occurs when the muscle lengthens and the load is high?

    <p>Eccentric contraction</p> Signup and view all the answers

    What is the effect of a high load on the velocity of muscle contraction?

    <p>It decreases the velocity</p> Signup and view all the answers

    What is the relationship between the force and velocity of muscle contraction?

    <p>The force is inversely proportional to the velocity</p> Signup and view all the answers

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