Dr Praveen Kumar Agrawal is teaching live on Unacademy Plus
Course: Locomotion and Movement -2 Lesson -B Structure of a Myofibril and Sarcomere DR. P. K. AGRAWAL M.Sc, PH.D., CSIR NET (JRF), SRF, GATE, FIAZ 20 Years of Pre-medical teaching experience Ex Faculty, Allen Career Institute, Kota Watch my Live Classes on Unacademy Plus
STRUCTURE OF A MYOFIBRIL Each myocyte internally contains many long cylindrical structures, called myofibrils, which are the basic structural units of skeletal muscles. .Myofibril forms the functional unit of the muscle. Each myofibril contains about soo myosin filaments and 3o0o acti filaments (a.a) These filaments are large polymerized molecules, which are responsible for bringing about the contraction process. Myosin filaments are thick and dark coloured filaments but actin filaments are the thin and light coloured. Both these types of filaments are partially interdigitated and thus myofibrils have alternate light and dark bands.
Structure of myofibril and banding pattern 2 Line H zone Band M Line A Sarco mure enta
Molecular structure of a part of myofibril (enlarged) A band M line I Band Z line Relaxed fibre Myosin Actin Sarcomere
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