What they mean is that mitochondria get the energy out of glucose in respiration: they use this energy to make a wonderful chemical called ATP. Cells need energy for other processes such as the synthesis of proteins from amino-acids and the replication of DNA.
Small intestine. The small intestine or small bowel is the part of the gastrointestinal tract between the stomach and the large intestine, and is where most of the end absorption of food takes place. The small intestine has three distinct regions â the duodenum, jejunum, and ileum. The duodenum is the shortest part of the small intestine and is where preparation for absorption begins. It also receives bile and pancreatic juice through the pancreatic duct, controlled by the sphincter of Oddi. The primary function of the small intestine is the absorption of nutrients and minerals from food.
Your small intestine and digestion. The small intestine is a long tube that is approximately 18 feet long (6 meters). The small intestine is called small because the diameter or the width of the tube is much less than the large intestine.The parts of the small intestine include the duodenum, jejunum and the ileum.leum. The ileum is the final part of the small intestine. It opens into the large intestine via the ileocecal valve. The ileum is preceded by the jejunum. This section of the small intestine is approximately 6 to 12 feet (3.5 meters) long.