Assertion: muscle fiber's sarcomere | /r/HasProperty | contractile units
Facets:
Source sentences:
text: Each myofibril is made up of thousands of sarcomeres (contractile units) that are composed of myofilaments.
text: This increase in size is due to growth from adding sarcomeres (contractile elements) as well as an increase in non-contractile elements like sarcoplasmic fluid.