Autonomic Nervous System Physiology

A 42-year-old woman from Mumbai presents with a 6-month history of recurrent episodes of palpitations, chest tightness, and a sensation of impending doom. During an episode in the clinic, she is noted to have a heart rate of 110/min, blood pressure 155/95 mmHg, and visible trembling. Her pupils are dilated. Interestingly, she reports that her symptoms are triggered by emotional stress and crowded places, and she has no cardiac pathology on investigation. A diagnosis of panic disorder is made. Which autonomic mechanism is primarily dysregulated in this patient's condition?

A 38-year-old woman undergoes testing to assess parasympathetic function. The patient is given a dose of acetylcholine via aerosol inhalation, and airway resistance is measured. Which test is being performed, and what is the physiological basis?

A 58-year-old man from Delhi presents to the emergency department with acute onset severe headache, palpitations, and profuse sweating for the past 2 hours. His blood pressure is 210/130 mmHg, heart rate 118/min, and respiratory rate 24/min. He appears anxious and tremulous. On examination, he has dilated pupils and piloerection. His past medical history is significant for a pheochromocytoma diagnosed 3 months ago, which he has not yet undergone surgery for. What is the primary autonomic mechanism responsible for his current clinical presentation?

Which is the most common neurotransmitter receptor type responsible for parasympathetic effects on cardiac rate and contractility?

Regarding the autonomic nervous system, all of the following statements are correct EXCEPT: