Involved in the trafficking and exocytosis of secretory vesicles in non-neuronal tissues. Mediates Ca(2+)-regulation of exocytosis acrosomal reaction in sperm. May mediate Ca(2+)-regulation of exocytosis in insulin secreted cells. . This is the function of SYT8 (synaptotagmin 8, Ensembl gene identifier ENSG00000149043).