Which statement about contractions is accurate?

Which statement about contractions is accurate?

• A. Concentric contractions shorten the muscle while generating force; eccentric contractions lengthen the muscle while generating force.
• B. Concentric contractions shorten the muscle but do not produce force; eccentric contractions lengthen the muscle without producing force.
• C. Concentric contractions lengthen the muscle while generating force; eccentric contractions shorten the muscle while generating force.
• D. Both contractions shorten the muscle and generate equal force.

Answer: (A)