C. The passage out of the stomach, called the pylorus, where a muscular contraction prevents the escape of undigested food.
D. The duodenum, and the ducts through which the bile and pancreatic juices enter and mingle with our food.
876. Why do we not feel the food being transmitted through the throat?
Because the nerves of the body differ in their powers: some are nerves of feeling, some of motion, and others are nerves of the senses. The nerves of feeling are most abundantly distributed to those parts where feeling is most useful and necessary to us. But the faculty of feeling our food undergoing digestion would be no service to us whatever; therefore the nerves of motion are plentifully distributed to the throat and stomach, but very few of the nerves of feeling—just as many as will tell us when we eat anything too hot, or too cold, or that the stomach is out of order.
877. Why do we feel uneasy after eating to excess?
Because the stomach is distended, and presses upon the other organs by which it is surrounded.
"Who satisfieth thy mouth with good things; so that thy youth is renewed like the eagles."—Psalm ciii.