sarkoplasmatiskendoplasmisk
Sarkoplasmatiskendoplasmisk refers to the sarcoplasmic reticulum, a specialized type of smooth endoplasmic reticulum found in the cytoplasm of striated muscle cells, known as myocytes. This organelle plays a crucial role in muscle contraction by storing and releasing calcium ions. The sarcoplasmic reticulum forms a complex network of tubules and cisternae that surround myofibrils, the long, contractile filaments within muscle cells.
The membrane of the sarcoplasmic reticulum actively pumps calcium ions from the sarcoplasm into its lumen,
Following contraction, the sarcoplasmic reticulum once again actively pumps calcium ions back into its lumen, lowering