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MBBS QUESTION #10234
Question 1
An isometric muscle contraction is best defined as one in which:
  • Muscle tension increases while overall muscle length remains essentially unchanged✔️
  • Muscle length shortens while tension remains constant throughout
  • Both tension and length change proportionally and simultaneously
  • Neither cross-bridge cycling nor ATP hydrolysis occurs
Correct Answer Explanation
In an isometric contraction, the muscle generates tension against a fixed load it cannot move (e.g., pushing against an immovable wall), so length stays constant while tension rises — in contrast to an isotonic contraction, where tension remains constant as the muscle shortens (or lengthens) against a constant load.