Motor Unit Fibers Overview

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Questions and Answers

What type of fibers are predominant in the drumstick of a chicken or turkey?

  • Cardiac fibers
  • Slow twitch fibers (correct)
  • Intermediate twitch fibers
  • Fast twitch fibers

What acts as the regulatory subunit for myosin light chain kinase in muscle cells?

  • Collagen
  • Calmodulin (correct)
  • Troponin
  • Myoglobin

What type of enzyme is myosin light chain kinase?

  • Hydrolase enzyme
  • Phosphatase enzyme
  • Kinase enzyme (correct)
  • Ligase enzyme

What is the role of myosin light chain phosphorylation in muscle contraction?

<p>Promotes cross-bridge cycling (D)</p> Signup and view all the answers

What do all kinases have in common in terms of their enzymatic activity?

<p>Add phosphate groups to proteins (B)</p> Signup and view all the answers

Where are the thin filaments attached in muscle cells that lack Z-lines?

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

What type of muscle fibers are most fuel-efficient and tend to be weaker?

<p>Slow-oxidative fibers (D)</p> Signup and view all the answers

Which type of muscle fibers are important for power and endurance, suitable for mile track runners?

<p>Fast-oxidative fibers (C)</p> Signup and view all the answers

What is the main function of creatine phosphate in muscle cells?

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

Which process results in a lower ATP yield but is faster and anaerobic?

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

What is the function of myoglobin in muscle cells?

<p>Oxygen binding and transportation (B)</p> Signup and view all the answers

Which type of muscle fibers are the most powerful but the least efficient in fuel utilization?

<p>Fast-glycolytic fibers (C)</p> Signup and view all the answers

What is the term used to describe the rigid cross-linking of thick filaments to thin filaments in muscles?

<p>Rigor associated with death (D)</p> Signup and view all the answers

What initiates the binding step in muscle contraction that is calcium dependent?

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

What causes the displacement of the Myosin head during muscle contraction?

<p>Spontaneous conformational change (B)</p> Signup and view all the answers

Which process re-energizes the Myosin head during muscle contraction?

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

In muscle cells, what triggers the activation of contraction in response to neuromuscular transmission?

<p>Acetylcholine release (A)</p> Signup and view all the answers

What event causes an excitatory end-plate potential leading to an action potential in the muscle membrane?

<p>Release of acetylcholine (B)</p> Signup and view all the answers

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