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

Multiple Choice

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

A) Presence or absence of T tubules
B) Presence or absence of regular arrays of thick and thin filaments
C) Number of mitochondria
D) Number of cell nuclei
E) Presence or absence of a sarcoplasmic reticulum