Cytosolic calcium-activated calcium channel that mediates the release of Ca(2+) from the sarcoplasmic reticulum into the cytosol and thereby plays a key role in triggering muscle contraction following depolarization of T-tubules (PubMed:11741831, PubMed:16163667, PubMed:18268335, PubMed:18650434, PubMed:26115329). Repeated very high- level exercise increases the open probability of the channel and leads to Ca(2+) leaking into the cytoplasm (PubMed:18268335). Can also mediate the release of Ca(2+) from intracellular stores in neurons, and may thereby promote prolonged Ca(2+) signaling in the brain. Required for normal embryonic development of muscle fibers and skeletal muscle. Required for normal heart morphogenesis, skin development and ossification during embryogenesis (By similarity). {ECO:0000250|UniProtKB:E9PZQ0, ECO:0000269|PubMed:18268335, ECO:0000269|PubMed:18650434, ECO:0000269|PubMed:26115329, ECO:0000305|PubMed:11741831, ECO:0000305|PubMed:16163667}. This is the function of Ensembl gene identifier ENSG00000196218 (RYR1, ryanodine receptor 1).