Myofibrils are primarily composed of proteins called actin and myosin. These proteins are arranged in repeated units called sarcomeres, which are responsible for muscle contraction. Other proteins such as troponin and tropomyosin also play important roles in regulating muscle contraction.
Myofibrils are primarily composed of proteins called actin and myosin. These proteins are arranged in a repeating pattern along the length of the myofibril, forming the sarcomeres, which are the functional units responsible for muscle contraction.
thick filaments and thin filaments
Thin filaments consist primarily of the protein actin, coiled with nebulin filaments. Thick filaments consist primarily of the protein myosin, held in place by tit in filaments.
Myofibrils are made up of actin (thin filaments) and myosin (thick filaments).
The sarcoplasmic reticulum are the membranous interconnecting channels and sacs that surround and run parallel to the myofibrils.
Myofibrils
myofibrils
myofibrils
myofibrils
myofibrils
The sarcoplasm