Science / Biology / Sarcomeres: The functional units of skeletal muscle; consist of filaments of myosin and actin.
Science / Biology / Actin: The protein from which microfilaments are composed; forms the contractile filaments of sarcomeres in muscle cells. MORE
Science / Biology / Myosin: Thick protein filaments in the center sections of sarcomeres. MORE
Science / Biology / Z Lines: Dense areas in myofibrils that mark the beginning of the sarcomeres. The actin filaments of the sarcomeres are anchored in the Z lines. MORE