1.The esophagus of the digestive tract is about 10-14 inch long and 1 inch in diameter.
2.The salivary glands are the first to act on food; by secreting saliva that contains enzymes for catalyzing starch into smaller molecules.
3.Every individual produces 16 to 48 ounces saliva per day.
4.The digestive juices produced by stomach are acidic in nature.
5An adult stomach has the capacity to hold around 1.5 liters food material.
6.The digestive juices secreted by the pancreas contain enzymes for catalyzing proteins, fats and carbohydrates; whereas liver produces bile juice for digesting fats.
7.About 11 liters of fluid, digestive juices and digested food is circulated in the digestive system, of which only 100 milliliter is excreted as waste product.
8. We make 1 to 3 pints of saliva a day
9* Muscles contract in waves to move the food down the oesophagus. This means that food would get to a person's stomach, even if they were standing on their head.
10.The digestive tract is made up of hollow organs - mouth, esophagus, stomach, small intestine, large intestine and anus. The large intestine is also referred to as colon-rectum. All these organs are lined by mucous membrane (mucosa).