Digestion is the process by which the food we eat is broken down into nutrients that can be used by the body. Carbohydrates are broken down into sugars, which can be used in respiration. Proteins are broken into amino acids, which can be used for growth and repair in our bodies. The digestive system has a number of different, well adapted parts that work together to take food from bite-size to useful molecules that your body can use. The following activities aim to introduce students to this process with fun visual aids.
Parts of the Digestive System organs Diagram - science activities
The mouth is where food enters the alimentary canal. It is chewed by teeth which start to break food down. Food is mixed with saliva containing enzymes.
This is a fibromuscular tube which connects the mouth to the stomach. Food is pushed down using a wave-like muscular motion called peristalsis.
The stomach is a muscular organ where food is mixed with gastric juices. Gastric juice has a low pH and it is used to help digest food and kill potentially harmful bacteria.
The Digestive System
The anus is where feces leaves the alimentary canal.
The large intestines are made up of two parts: the colon and the rectum. In the colon, water is reabsorbed from the food. Feces is stored in the rectum.
The small intestines have three parts: the duodenum, the jejunum and the ileum. Here, food is mixed with enzymes and bile. The enzymes speed up the digestion process. Nutrients are then absorbed into the bloodstream.