choose the correct statement in refrence to primary myofilament

1. they are more than secondary myofilament
2. primary myofilament have smooth surface
3. primary myofilament consists of proteins
4. they slid during muscle contraction

Hello Student
Correct answer is 3. Primary myofilament consist of proteins
Myofilament are the filaments of myofibril constructed from protein. Secondary myofilament have rough surface due to projectile head and do not slide during muscle contraction. and also they are fewer in number.