In 2015 Illinois will again process all appointment renewals electronically through the National Insurance Producer Registry (NIPR). 1  Appointment renewal date is November 1, 2015. 2  Appointment renewals will be electronically processed through NIPR.
myofibril - one of many contractile filaments that make up a striated muscle fiber. myofibrilla, sarcostyle. sarcoplasm - the cytoplasm of a striated muscle fiber. striated muscle cell, striated muscle fiber - an elongated contractile cell in striated muscle tissue.
myofibers appear striated or striped due to the presence of I light bands where the thin filaments are located and A dark bands where they are thick and thin filaments. Describe the microscopic anatomy of skeletal muscle cells (myofibers): striations.yofibers appear striated or striped due to the presence of I light bands where the thin filaments are located and A dark bands where they are thick and thin filaments. Describe the microscopic anatomy of skeletal muscle cells (myofibers): striations.