Liha töötlemine
Therefore, these bands between two Z-lines is the sarcomere. In a
are called I-bands in reference to this isotro- relaxed muscle cell, the distance between
pic property. The dark band appears dark two Z-lines (and thus the length of the sarco-
because it is anisotropic and is thus called the mere) is approximately 2.2 μm. A single
A-band. myofibril is made up of a large number of
The myofibrils are abundant in skeletal sarcomeres in series. The length of the myo-
muscle cells, making up nearly 80–90% of fibril and also the muscle cell is dependent
the volume of the cell. Myofibrillar proteins on the number of sarcomeres. For example,
are relatively insoluble at physiological ionic the semitendinosus, a long muscle, has been
strength, requiring an ionic strength greater estimated to have somewhere in the neigh-
than 0.3 to be extracted from muscle. For this borhood of 5.8 × 104 to 6
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