The small intestine, which is made up of duodenum, jejunum, and ileum, is responsible for breaking down partially digested carbohydrates, proteins, and fats. Moreover, its function is to absorb the nutrients from the food that we eat. The substances are absorbed by the capillaries that are found in the intestinal walls.

When we swallow the food, it enters the digestive tract, which propels the food into the stomach. During this process, a mechanism called peristalsis is involved. Peristalsis, which involves the sphincter muscle, is the involuntary muscle contractions that help move the food into the esophagus, stomach, and intestine.

1. Avoid eating too much food
2. Eat in a normal speed
3. Avoid eating spicy or high-fat foods

As the food passes through the digestive system, it is broken down or digested into simpler substances that can be absorbed by the body. These substances, which contain nutrients, are absorbed by the body via the small intestine. In turn, these nutrients make their way into the capillaries, then into the bloodstream, where they are distributed throughout the rest of the body.

Here is a sample menu with a full day of meals that can be served to a person who is lactose intolerant:

Breakfast: Eggs with bacon, whole wheat toast with peanut butter, and orange juice

Lunch: Grilled chicken, brown rice, steamed vegetables, banana, and water

Snack: Deli meat sandwich and lemonade

Dinner: Plain hamburger, baked potatoes, cubed cantaloupe and watermelon, and water

Here is a sample script for a play:

A long time ago, there was a witch who concocted a magic potion that would allow someone to get a perfect, healthy set of teeth. She tried to use it in one of her cats. Upon using the potion, the toad became a happy smiling amphibian.

Cat: I am very much delighted with my new teeth! I prefer to eat candies rather than feeding on filthy fishes!

Witch: It seems like you are not being careful in choosing what to eat. Look after your teeth, Mr. Cat. Avoid eating too many sweets. You must brush them so you don’t get a toothache.

However, the cat did not pay attention to the witch. He believed that these teeth were strong enough and that he didn’t need to brush them. He didn’t even try to eat fewer candies and chocolates.

One day, the tooth of the toad started to ache. He discovered that there were holes in his teeth. Some of his teeth are already starting to fall out. Eventually, all of his teeth started to fall out and he can no longer chew his food. Poor cat, he lost his ability to eat.

Here is a sample script for a play:

A long time ago, there was a witch who concocted a magic potion that would allow someone to get a perfect, healthy set of teeth. She tried to use it in one of her cats. Upon using the potion, the toad became a happy smiling amphibian.

Cat: I am very much delighted with my new teeth! I prefer to eat candies rather than feeding on filthy fishes! (Click to see the full solution)

Human digestion starts in a mouth and includes two processes, mechanical (chewing, mashing and breaking food down) and chemical ( secretions produced by digestive organs). In the mouth, teeth break the food into small pieces. Salivary glands are producing digestive juices that contain an enzyme that begins to break down the scratches and sugars in food. Tongue prepares chewed food for swallowing by shaping it and epiglottis prevents food from entering the respiratory system. By swallowing, food goes through the pharynx to the esophagus which connects the pharynx with the stomach. Through it, food is moved by intense peristalsis. A sphincter muscle allows food to move into the stomach. Three tasks are performed in the stomach. Firsty, food is mixed with gastric juices. The hydrochloric acid kills bacteria and creates an acid environment for pepsin which digests protein. Then the stomach holds the food for further digestion and finally peristalsis moves it into the small intestine through sphincter muscle. Duodenum, jejunum and ileum together form the small intestine. Food is mixed with the juices of two other digestive organs there. Enzymes that break down the carbohydrates, fats and proteins are produced by the pancreas. The liver produces bile which is important in breakdown and absorption of fats. Almost 90 percent of nutrients are absorbed there and unabsorbed material moves by peristalsis into the large intestine in the form of liquid and fiber. The function of the large intestine is to absorb water, vitamins, salts and to eliminate waste. Waste substances from the large intestine pass into its final part, which is the anus (intestinal opening) through which feces are regularly expelled.

Mouth-pharynx-esophagus-stomach-small intestine-large intestine-anus

For functions of each organ and detailed description please see the explanation.