Question

Which cells can contract and expand?Explain.

Answer 1

Muscle fibers can contract and relax which enables movement in the body.

Answer 2

Muscles work by expanding and contracting. Muscles have long, thin cells that are grouped into bundles. When a muscle fiber gets a signal from its nerve, proteins and chemicals release energy to either contract the muscle or relax it. When the muscle contracts, this pulls the bones it's connected to closer together.