Assertion: muscle fiber's sarcomere | /r/CapableOf | decrease in length
Facets:
value: actively
type: MANNER
Source sentences:
text: When the Actin filaments (in the I-band) and the Myosin filaments (in the A-band) slide over one another, the Z-bands are drawn closer together, the Sarcomere actively decreases in length, and, as a result of collective Sarcomere action, the whole muscle Fiber shortens.