æz ɐ dˈɪvələnt ˈaɪɑːn wɪð ɐn aɪˈɑːnɪk ɹˈeɪdɪəs sˈɪmɪlɚ tə ðæt ʌv kˈɑː tˈuː plˈʌs wˈʌn.θˈɜːtiːn ˌeɪɹˈɪŋɡ ænd zˈiəɹoʊ.nˈaɪnti nˈaɪn ˌeɪɹˈɪŋɡ ɹᵻspˈɛktɪvli, ˌɛsˈɑːɹ tˈuː plˈʌs ˈaɪɑːnz ɹᵻzˈɛmbəlz kˈælsiəmz ɐbˈɪləɾi tə tɹɐvˈɜːs kˈælsiəmsᵻlˈɛktɪv ˈaɪɑːn tʃˈænəlz ænd tɹˈɪɡɚ nˈʊɹɹətɹˌænsmɪɾɚ ɹᵻlˈiːs fɹʌm nˈɜːv ˈɛndɪŋz.
As a divalent ion with an ionic radius similar to that of Ca2+ (1.13 Å and 0.99 Å respectively), Sr2+ ions resembles calcium's ability to traverse calcium-selective ion channels and trigger neurotransmitter release from nerve endings.