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A sarcomere is defined as the segment between two neighbouring Z-lines (or Z-discs). In electron micrographs of cross-striated muscle, the Z-line (from the German "zwischen" meaning between) appears in between the I-bands as a dark line that anchors the actin myofilaments. Surrounding the Z-line is the region of the I-band (for isotropic). I ...
All thin filaments are attached to the Z-line. Elastic filaments, 1 nm in diameter, are made of titin, a large springy protein. They run through the core of each thick filament and anchor it to the Z-line, the end point of a sarcomere. [citation needed] Titin also stabilizes the thick filament, while centering it between the thin filaments. It ...
These Z-discs are dense protein discs that do not easily allow the passage of light. The T-tubule is present in this area. The area between the Z-discs is further divided into two lighter colored bands at either end called the I-bands or Isotropic Bands, and a darker, grayish band in the middle called the A band or Anisotropic Bands.
Z-line may refer to: J/Z (New York City Subway service) Z-line (IRC), a type of Internet Relay Chat access ban; Gastroesophageal junction, that joins the oesophagus ...
Midaxillary line: A vertical line passing through the apex of the axilla. Posterior axillary line: A vertical line passing through the posterior axillary fold. Scapular line: A vertical line passing through the inferior angle of the scapula. Paravertebral line: A vertical line corresponding to the tips of the transverse processes of the vertebrae.
The z-line defines the borders of each sarcomere and act as the connection point between the thin filaments. The t-tubules and sarcoplasmic reticulum are used in conjunction to receive and direct the calcium ions and cause contraction. Once contracted, the clear H-zone between the actin filaments disappears as the filaments move towards each other.
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Cellular anatomy [ edit ] The darker bands within skeletal muscle, known as anisotropic bands (A bands), encompass both thick and thin filaments and constitute the central region of the sarcomere, extending across the H-zone.