Oxygen and carbon dioxide are exchanged in the lungs, and the body responds to changing energy demands by adjusting the rate of ventilation.
ˈɑːksɪdʒən ænd kˈɑːɹbən daɪˈɑːksaɪd ɑːɹ ɛkstʃˈeɪndʒd ɪnðə lˈʌŋz, ænd ðə bˈɑːdi ɹᵻspˈɑːndz tə tʃˈeɪndʒɪŋ ˈɛnɚdʒi dᵻmˈændz baɪ ɐdʒˈʌstɪŋ ðə ɹˈeɪt ʌv vˌɛntɪlˈeɪʃən.