2. 1.7 liters of saliva is produced each day i.e. 2 cans of soda.
3. The esophagus is approximately 25 cm long.
4. Muscles contract in waves to move the food down the esophagus. This means that food would get to a person's stomach, even if they were standing on their head.
5. An adult's stomach can hold approximately 1.5 liters of material.
6. Every day 11.5 liters of digested food, liquids and digestive juices flow through the digestive system, but only 100 ml is lost in faeces.
7. In the mouth, food is either cooled or warmed to a more suitable temperature.
8. You burp to release extra air that you swallow if you eat fast, drink carbonated drinks, or smoke.
9. Hiccups can be caused by a change in temperature that happens suddenly.
10. Platypuses do not have stomach.
11.The stomach has the ability to stretch and hold up to 4 pounds of food at one time.
12. The human gut is home to a complex ecosystem of roughly 300 to 500 bacteria.
13. The liver is the largest internal organ and has over 500 different functions including fighting off infection and neutralizing toxins.
14. Your stomach growling is called "borborygmi," and it's actually your intestines full of hot air.