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terminal cisterna
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terminal cisterna

biology
Also known as: terminal cisternae
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Quick Summary

In biology, a terminal cisterna is a part of the sarcoplasmic reticulum, a network of membranes within muscle cells. These cisternae are enlarged sacs that are in contact with the transverse tubules (T tubules) of the muscle fiber.

The sarcoplasmic reticulum plays a crucial role in muscle contraction by storing and releasing calcium ions. The terminal cisternae are specifically identified as the sites from which calcium ions are released into the sarcoplasm when a muscle is stimulated. This release of calcium triggers the interaction between actin and myosin filaments, leading to muscle contraction. After contraction, the sarcoplasmic reticulum reabsorbs the calcium, allowing the muscle to relax. The term "cisterna" itself originates from Latin, meaning reservoir, reflecting its function in storing substances.12345

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5 Britannica Sources
  1. sarcoplasmic reticulum
  2. muscle - The myofibril
  3. muscle - Molecular mechanisms of contraction
  4. cisterna
  5. cistern

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