Question

in this image, what must the students’ muscles do to pull the rope?
a. flex and extend
b. loosen and extend
c. stretch and tighten
d. contract and relax

Explanation:

To pull the rope (as in a tug - of - war), muscles work in pairs. When a muscle contracts, it generates force, and when it relaxes, it allows for the movement and re - positioning needed for continued action. Flexing and extending are more about joint movement description rather than muscle function in terms of force production for pulling. Loosening is not a standard term for muscle action, and stretching/tightening is not the accurate way to describe the active process of muscle movement for this action. Muscles must contract (to generate force to pull) and relax (to allow for the muscle to be ready for the next contraction or to adjust position) to pull the rope.

Answer:

D. contract and relax