Digestion is the ____ of food into smaller pieces. We need food for nutrients and ____. There are two types of digestion: physical digestion and ____ digestion. Digestion begins in our ____ . Our teeth carry out ____ digestion by cutting and chewing our food into smaller pieces. There are four different types of teeth: incisors, ____, ____ and pre-molars. An adult has ____ teeth. Chemical digestion also occurs in the mouth. ____ is produced by salivary glands which are found in our mouth. Saliva contains an ____ called amylase which breaks down starch. Saliva mixes with our food to form a bolus. We then swallow our food and it is pushed down into our foodpipe, which is also called the____. A tiny flap, called the ____, prevents food entering our windpipe/trachea. A wave of muscular action pushes food along the oesophagus, this motion is called peristalsis. Food then enters the ____. The stomach is J-shaped muscular bag. It is lined with ____ to prevent acid and enzymes damaging the stomach walls. Physical and chemical digestion occurs here. Physical digestion occurs by ____ the food. Hydrochloric acid and digestive enzymes carry out ____ digestion in the stomach. They mix with the food to form ____. The food moves on to the ____. The small intestine is very ____ (6-7m). This provides a large surface area for digestion and absorption. Majority of our food is digested in the first part of the small intestine. The liver and ____ release substances into the small intestine to aid digestion. The ____ releases bile which helps to breakdown fats and the pancreas releases pancreatic juice. ____ occurs in the second section of the small intestine. Our small intestine has millions of finger-like projections called ____ which aid in the absorption of nutrients. ____ pass through villi where they are then absorbed into our bloodstream. The remaining undigested food moves on to the ____. The large intestine is ____ (1.5m) compared to the small intestine. However, it is ____ in diameter and does not have villi. The role of the large intestine of to ____ any ____ from the remaining undigested food. It also ____ the undigested food until it is eliminated from the body. The removal of undigested food from the body is called ____. The large intestine is sometimes called the ____. There are billions of bacteria living in the large intestine. These are ____ bacteria which benefit us in many ways. They break down undigested carbohydrates, and produce vitamins B and K.

The Digestive System

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