What Role Does the Sarcoplasmic Reticulum Play in Muscle Types?
The SR is present in all types of muscle cells, including skeletal, cardiac, and smooth muscle, but its structure and function can vary. In skeletal muscle, the SR is well-developed and forms extensive networks around each myofibril. In cardiac muscle, the SR is less extensive but still crucial for Ca2+ regulation. In smooth muscle, the SR is less organized and Ca2+ release is more dependent on extracellular sources.
