The answer you are looking for is “organ system”
Dr. Alexander Winemann is a Biologist who specializes in organic chemistry.
An organism? There is nothing past organ systems
my·o·fi·bril
Dictionary result for myofibril
/ˌmīōˈfībrəl,-ˈfib-/
noun
noun: myofibril; plural noun: myofibrils
any of the elongated contractile threads found in striated muscle cells.
The answer to this question is Betz Cells
