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.
The area between two Z lines, a sarcomere, can be considered to be the primary structural and functional unit directly responsible for muscle contraction. The myofibril can thus be thought of as a stack of sarcomeres. The A band, which contains thick filaments partly overlapped with thin filaments, appears dark.