Skeletal Muscles Quiz

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Questions and Answers

Which function is primarily associated with the ability of skeletal muscles to pull on tendons?

  • Producing movement (correct)
  • Guarding body entrances
  • Storing nutrients
  • Maintaining posture

What is the role of epimysium in skeletal muscles?

  • It surrounds individual muscle fibers.
  • It encases the entire muscle. (correct)
  • It initiates electrical impulses in muscle cells.
  • It contains the blood supply to the muscle.

What characterizes skeletal muscle fibers?

  • They are known for their striations. (correct)
  • They contract involuntarily.
  • They develop from neural cells.
  • They are uninucleate cells.

Which component is NOT part of skeletal muscles?

<p>Neurotransmitters (C)</p> Signup and view all the answers

How do skeletal muscles generally respond to stimulation?

<p>By contracting voluntarily. (B)</p> Signup and view all the answers

What is one of the primary roles of muscles in maintaining body temperature?

<p>They produce and release heat. (C)</p> Signup and view all the answers

What initiates an action potential within muscle fibers?

<p>A change in membrane permeability to sodium. (D)</p> Signup and view all the answers

What is a common property of tendons and aponeuroses?

<p>Both attach skeletal muscles to bones. (C)</p> Signup and view all the answers

What is necessary for muscle movement to occur when tension is produced?

<p>The tension must overcome the load. (B)</p> Signup and view all the answers

Which factor does NOT affect the amount of tension produced by an individual muscle fiber?

<p>Type of muscle exercise performed (C)</p> Signup and view all the answers

What directly influences the number of power strokes performed by myosin heads?

<p>The zone of overlap between filaments (C)</p> Signup and view all the answers

In a myogram, what does the y-axis typically represent?

<p>Tension developed in muscle fibers (C)</p> Signup and view all the answers

Which of the following describes muscle twitch generation accurately?

<p>Muscle contractions require repeated stimuli. (D)</p> Signup and view all the answers

What happens to sarcomeres during the contraction of a muscle?

<p>They shorten together at the same rate. (A)</p> Signup and view all the answers

What is the length-tension relationship in muscle fibers?

<p>Maximal tension occurs at a specific sarcomere length. (C)</p> Signup and view all the answers

How does the frequency of stimulation affect muscle contraction?

<p>Increased frequencies lead to greater tension. (A)</p> Signup and view all the answers

What is the duration of a single stimulus-contraction-relaxation sequence?

<p>7–100 msec (C)</p> Signup and view all the answers

What physiological phenomenon describes an increase in peak tension from repeated muscle stimulations?

<p>Treppe (C)</p> Signup and view all the answers

Which condition is characterized by continuous contraction due to high stimulation frequency?

<p>Tetanus (B)</p> Signup and view all the answers

What effect does incomplete tetanus have on muscle relaxation?

<p>Eliminates the relaxation phase (C)</p> Signup and view all the answers

What results in maximum tension during muscle contraction?

<p>Optimal length of the sarcomere enabling max cross-bridge formation (D)</p> Signup and view all the answers

What is the maximum stimulus frequency mentioned for achieving incomplete tetanus?

<p>50/second (A)</p> Signup and view all the answers

What happens during the relaxation phase of muscle contraction?

<p>Cross-bridges detach as calcium ion levels decrease (D)</p> Signup and view all the answers

What disease is caused by the neurotoxin of the Clostridium tetani bacterium?

<p>Tetanus (B)</p> Signup and view all the answers

What occurs if there is no zone of overlap in muscle fibers?

<p>Cross-bridges cannot form (B)</p> Signup and view all the answers

What leads to a smooth and steady contraction in muscle fibers?

<p>High frequency of signals sent too rapidly (C)</p> Signup and view all the answers

What is the consequence of signals coming too quickly to the muscle?

<p>The muscle experiences sustained contraction (B)</p> Signup and view all the answers

Which phase of muscle contraction includes the latent period?

<p>Contraction phase (D)</p> Signup and view all the answers

What is a consequence of the sarcomere being too short during contraction?

<p>No tension can be produced despite overlap (A)</p> Signup and view all the answers

How does tension change as cytosolic calcium ion levels decrease?

<p>Tension decreases (C)</p> Signup and view all the answers

What is the primary role of tropomyosin during muscle relaxation?

<p>To cover binding sites on actin (D)</p> Signup and view all the answers

What characterizes the contraction phase of a muscle twitch?

<p>Initiation of cross-bridges and power strokes (B)</p> Signup and view all the answers

What type of muscular fiber proportion increases with improvements in aerobic endurance?

<p>Slow fibers (B)</p> Signup and view all the answers

What is the primary benefit of the cardiovascular system in relation to the muscular system?

<p>Delivers oxygen and nutrients (B)</p> Signup and view all the answers

What lever class is exemplified by a wheelbarrow?

<p>Second class lever (A)</p> Signup and view all the answers

Which example represents a third class lever?

<p>Elbow flexion by biceps brachii (C)</p> Signup and view all the answers

What is a drawback of a third class lever system, such as elbow flexion?

<p>Maximized speed at the expense of effective force (C)</p> Signup and view all the answers

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