That is because you are ignorant of all things biological. 'Warning signal to the throat'? You thought it was the gut because you do not understand biology.
Do you not even read the websites that YOU link to and quote?
"The “afferent” (flowing to the brain) parasympathetic information travels from the heart to the brain through the vagus nerve to the medulla, after passing through the nodose ganglion. The sympathetic afferent nerves first connect to the extrinsic cardiac ganglia (also a processing center), then to the dorsal root ganglion and the spinal cord. Once afferent signals reach the medulla, they travel to the subcortical areas (thalamus, amygdala, etc.) and then to the cortical areas."
Same for vomiting. My gosh - you have the Google, yes?
Google "vomiting center".
Gee, golly, I guess nobody ever thought about such a thing.
Obviously, the gut must send vocalization signals directly to the larynx via the RLN, what a
grand Creation!
"The noxious stimulus may cause release of serotonin from enterochromaffin cells of the digestive tract, which activates visceral afferents. The vagus nerves mediate responses from the stomach and proximal small intestine and the splanchnic nerves and spinal cord mediate responses from the entire small intestine. Emesis-related afferents from the periphery terminate primarily in the nucleus tractus solitarius and area postrema."
Nucleus tractus solitarius
Area postrema
Isn't it amazing how much information is actually out there, should one care to actually look for it and LEARN about it, rather than pontificating in the dark?
Oh - don't forget:
What is the purpose of the heart sending signals directly to the esophagus?
None, because it doesn't.
"The extrinsic cardiac ganglia, located in the thoracic cavity, have direct connections to organs such as the lungs and esophagus and are also indirectly connected via the spinal cord to many other organs, including the skin and arteries."
Does the heart have to communicate with the brain to both manage itself and the function of other organs?
Umm... This is sort of hilarious to me.
A cautionary tale on drawing conclusions after reading things in fields you have no demonstrable skill, education, or experience in.
You see, "cardiac" means 'pertaining to the heart', and in this context, refers to a region, i.e., 'near the heart'. Extrinsic means 'external to'. These ganglia are outside of the heart, and provide innervation to the heart AND to other organs. The heart does not use them to "manage itself and the function of other organs". Victoria Station, for example, does not allow only Victoria to get on trains...
The stomach has a 'cardiac region' (aka, 'cardia') - do you think this means that the stomach has its own heart?
Weird that you apparently stopped reading that webpage after you found your quote - a bit later, we see:
"The “afferent” (flowing to the brain) parasympathetic information travels from the heart to the brain through the vagus nerve to the medulla, after passing through the nodose ganglion. The sympathetic afferent nerves first connect to the extrinsic cardiac ganglia (also a processing center), then to the dorsal root ganglion and the spinal cord. Once afferent signals reach the medulla, they travel to the subcortical areas (thalamus, amygdala, etc.) and then to the cortical areas."
Nothing about stopping off at other organs. Or sending motor impulses to the larynx. Tell us - did you really just stop reading that when you got the quote you wanted, or did you read the whole thing and not understand it? or not think it mattered? Or hoped that nobody would be able to find it? I don't understand how you operate. It seems rather self-defeating.