Practice Quiz

ADA NBDE National Board Dental Part I

Category - NBDE

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Which of the following statements concerning skeletal muscle is correct?
  1. active tension depends on the extent of overlap between thick and thin filaments
  2. during contraction, thin filaments shorten, and thick filaments maintain constant length
  3. significant passive tension is generated at normal rest fiber length
  4. tension generation depends on myosin attachment to the z line
Explanation
Answer: A - Tension generation depends on attachment of the myosin head group to actin. This is referred to as cross bridge formation.
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