A biologist is looking at human muscle fibers under the microscope.Which criterion should the biologist use to distinguish between cardiac and smooth muscle fibers?

Question

Quizplus · Accepted Answer

Regular arrays of thick and thin filaments are present in skeletal and cardiac muscle fibers, but not in smooth muscle fibers. Therefore, the presence or absence of regular arrays of thick and thin filaments is the criterion that should be used to distinguish between cardiac and smooth muscle fibers.

A Biologist Is Looking at Human Muscle Fibers Under the Microscope.Which