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SCIENCE-DIGESTIVE SYSTEM

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harish kumaraverl

on 7 January 2011

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Transcript of SCIENCE-DIGESTIVE SYSTEM

DIGESTIVE SYSTEM WHAT IS DIGESTION? Digestion is the process of food breaking down into smaller molecules that our body uses as energy. These molecules are called nutrients. The cells in our body, use the healthy nutrients and reject the wastes. Organs of The Digestive System The Mouth The mouth is where digestion starts. When we take our first bite of food, we are breaking that piece of food into a form that our teeth can easily chew. Chewing our food breaks the food down into a form that our saliva can break down. After our mouth is finished breaking the food down, it will push the food to the back of your throat to be swallowed. Esophagus The esophagus is a muscular tube that takes the food that our mouth has finished chewing and pushes it to the stomach. The muscles in your esophagus squeeze the food like toothpaste inside a tube. The esophagus connects our mouth and pharynx to the stomach. Stomach Your stomach muscles squeeze and churn the food in your stomach for about 3 hours. They mix the food with digestive acids that break the food down into a thick fluid.When the stomach is done, it sends the thick fluid to your small intestine. Small Intestine Duodenum The food moves to the duodenum, which is the first 12 inches of the small intestine. If undigested food arrives at the duodenum, it will signal the stomach to slow down. It also gets secretions from the pancreas, liver and gallbladder to help it digest the fat in the foods. Pancreas The pancreas, which is behind the stomach sends enzymes which digest carbohydrates, fats and proteins. The pancreas also neutralizes the hydrochloric acid from the stomach. This proctects the small intestine from getting harmed. Liver The liver has many functions. It is responsible for the storage of nutrients and the production of bile. Bile is a dark green or yellow fluid produced by the liver which is sent to the gallbladder for storage. Bile helps in the process of digesting lipids in the small intestine. Gallbladder The gallbladder is located behind the liver. Bile is released from the gallbladder when fat is in the duodenum. Bile emulsifies fat, which serves as an important part of digestion. Wastes from the liver are eliminated through the gallbladder. From the duodenum, the chyme goes through the rest of the small intestine. At a diameter of 1 inch and approximately 25 feet long, this is where most of the digestion happens. Instead of using acid to digest the food like the stomach, the small intestine environment is alkaline. The small intestine sucks all the nutrients out of the chyme which is then sent to the large intestine. Large Intestine The small intestine gives the left overs to the large intestine. It is about 2 inches wide and 5 to 6 feet long and has lots of bacteria in it. But, the bacteria helps the intestine with absorbing water and some nutrients. Food is no longer broken down in the large intestine. The large intestine's job is to remove all the water from the food, and send the remains to the anus. Cells Cells are the main structure and foundation of all living things. There are different types of cells which make differents types of organs and systems. For example, skin cells, bloods cells, muscle cells and nerve cells. Tissues Cells that are similar in functions and origin come together to form tissue. These tissues have one main function which helps the organ they are found in. For exmaple, tissues found in the stomach help in the break down of foods inside the stomach. Organs Organs are made up of similar tissues which have similar functions. These tissues cooperate with each other to form an organ with one main function. For example, the heart has tissues which work together and have one main function. Organ Systems Organ systems are made up of organs that are related in functions. Multiple organs that are related make up a sytem that carries out a specific function that benefits our body. For example, the digestive sytem helps our body take in nutrients and let out wastes. HARISH KUMARAVERL
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