Define the following structure.
Muscle, Muscle fibre, Myofibril, Sacomere, Filaments

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Solution

Structure and organisational level Description
Muscle (Organ) A muscle consists of hundred to thousands of muscle cells plus connective tissue wrappings the blood vessels and nerve fibres.
Muscle fibre A muscle fibre is a multinucleated cell. It has a banded appearance. A muscle fibre is basically formed when a large unit of myofibrils are arranged together.
Myofibril Myofibrils are rod-like contractile elements. Composed of sarcomere arranged end to end.
Sarcomere A sarcomere is a contractile unit composed of filaments made up of contractile elements.
Filaments Filaments are the smallest unit of a muscle. These are of two types thick and thin filament. Thick filaments contain myosin molecule and thin filaments contain actin molecule.

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