The sarcoplasmic reticulum are the membranous interconnecting channels and sacs that surround and run parallel to the myofibrils.
Sarcolemma
Actin & Myosin compose myofibrils.
Myofibrils
myofibrils
myofibrils
myofibrils
actin and myosin
Myofibrils!
myofibrils
actin and myosin
True.
The sarcoplasm
myofibrils