Short Answer: A myofibril is smaller than a myofiber (muscle fiber). Long Answer: Skeletal Muscle Hierarchy: Muscle Organ Perimysium = white fibrous connective tissue & ar…eolar connective tissue that surrounds each fascicle Fascicle = bundle of skeletal muscle fibers .
Endomysium = areolar connective tissue that surrounds each muscle fiber .
Muscle Fiber ( Myofiber) = a muscle cell .
Myofibrils = contractile protein organelles .
Myofilaments = contractile proteins composed of: .
thick filaments = made of myosin .
thin filaments = made of actin . ( Full Answer )
The myofibrils are cells in the muscle that provide energy to them and to atrophy is to shrink or become less, so myofibril atrophy is the shrinking or lessening or those cell…s within the muscle for any reason(such as lack of exercise or injury) ( Full Answer )