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A 54- year-old man presents to the clinic with a two-week history of anxiety, profuse sweating, heat intolerance, and severe headaches. He notes that these symptoms seem to come and go, but he really notices when he is working in his garden in the mornings. He also notes that the headache never really goes away. Upon further questioning, he remembered there were times when he felt like his heart was racing and "beating funny" like it would "come out of his chest". During physical examination, his blood pressure was 152/93 (normal 120/80), which did not decrease after resting quietly for an hour. The attending physician ordered a thyroid panel to determine blood levels of T3/T4 and had the patient record his blood pressure for a 24-hour period. The thyroid results were normal.Which of the following sympathetic pathways is responsible for an increase in heart rate?

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