ðə sˌɪmpəθˈɛɾɪk ɡˈæŋɡliə ˈækt dᵻɹˈɛktli ɔnðə blˈʌd vˈɛsəlz ðeɪ ˈɪnɜːvˌeɪt θɹuːˈaʊt ðə bˈɑːdi, kəntɹˈoʊlɪŋ vˈɛsəl daɪˈæmɪɾɚ ænd ɹᵻsˈɪstəns, wˌaɪl ðɪ ɐdɹˈiːnəl mˈɛdʌlə ˌɪndɚɹˈɛktli kəntɹˈoʊlz ðə sˈeɪm ˈækʃən θɹuː ðə ɹᵻlˈiːs ʌv ˈɛpɪnˌɛfɹiːn ænd nˈoːɹpaɪnfɹˌiːn.
The sympathetic ganglia act directly on the blood vessels they innervate throughout the body, controlling vessel diameter and resistance, while the adrenal medulla indirectly controls the same action through the release of epinephrine and norepinephrine.