Final answer:
The nucleus tractus solitarius controls vomiting caused by bloodborne toxins and motion sickness, with connections to the area of postrema and the vagus nerve.
Step-by-step explanation:
The nucleus tractus solitarius controls vomiting triggered by a variety of stimuli, including toxins in the bloodstream, as well as mismatches in sensory information that can lead to motion sickness. The area postrema, which is located next to the fourth ventricle and is responsible for inducing emesis, is not shielded by the blood-brain barrier, making it susceptible to circulating toxins. Additionally, the area postrema has connections with the solitary nucleus and the dorsal motor nucleus of the vagus nerve, which are part of the autonomic system and play a role in vomiting that occurs with motion sickness due to conflicting vestibular and visual sensory input.