Design Prior to, and following, a 30-min distal oesophageal infusion of 0.15 M hydrochloric acid, pain thresholds to electrical stimulation were determined ... with concomitant withdrawal of skin ...
Digestion begins in your mouth. Your teeth grind the food you eat and mix it with saliva to form a kind of ball, known as a bolus. Your esophagus is a flattened muscular tube that connects your mouth ...