The heart resembles that of the amphibian but there is a septum which more completely separates the oxygenated and deoxygenated bloodstreams.
ðə hˈɑːɹt ɹᵻzˈɛmbəlz ðæt ʌvðɪ æmfˈɪbiən bˌʌt ðɛɹ ɪz ɐ sˈɛptəm wˌɪtʃ mˈoːɹ kəmplˈiːtli sˈɛpɚɹˌeɪts ðɪ ˈɑːksɪdʒˌɛneɪɾᵻd ænd diːˈɑːksɪdʒˌɛneɪɾᵻd blˈʌdstɹiːmz.