The digestive system is a group of organs that work together to convert food into energy that the body's cells can use. Digestion begins in the mouth when you chew your food and the teeth break it down into smaller pieces. This food would end up in the small intestine, and as it passes through the gastrointestinal tract, it mixes with many digestive juices, which breaks down larger foods that have not been removed from the mouth. Once all of these foods have been broken down to the appropriate size, the body can absorb them through the small intestine into the bloodstream, which then passes the collected nutrients to the rest of the body. The wasted products would then pass through the large intestine and exit the body. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”? Get the original essay All the organs that work with the digestive system are the salivary gland, esophagus, liver, stomach, gallbladder biliary, pancreas, small intestine and large intestine. The salivary gland is known to secrete saliva which contains an enzyme amylase which breaks down carbohydrates into starch. The esophagus, called the alimentary canal, transfers all food from the mouth to the stomach. The liver would secrete bile to emulsify fats and in the stomach chemical breakdown would occur with acid and enzymes. Chemical and mechanical digestion. The cells of the pancreas secrete digestive enzymes. Finally in the small intestine, all the nutrients and energy would be absorbed and transferred into the bloodstream and all the indigestible waste would go into the large intestine and be transformed into stool. The respiratory system consists of the airways, lungs and stools. the muscles of respiration. When you breathe in, your body takes in oxygen from your mouth or nose depending on where you are breathing from. Once your body absorbs the oxygen, it passes through the windpipe, known as the windpipe. This filters the air so that any harmful bacteria in the air cannot penetrate deeper into the body. The oxygen then goes to the bronchi where the oxygen will be separated into 2 tubes which will go into each lung. The bronchi are known to have tiny lined hairs along which germs and dust introduced along with oxygen trample. Once these unwanted substances are trapped, your body will trap them with mucus so you can get rid of them by sneezing or spitting. Carbon dioxide will be exhaled through the lungs once oxygen enters the bloodstream. Aerobic respiration occurs when glucose reacts with oxygen to release energy. Red blood cells carry oxygen throughout the body, and every cell needs oxygen to stay alive. Oxygen is needed to burn fatty acids and sugar in cells to produce energy. Keep in mind: this is just a sample. Get a personalized article from our expert writers now. Get a Personalized Essay The cardiovascular system is made up of the heart, lungs, and veins. , arteries and vessels. This system is responsible for the circulation of blood, oxygen, hormones and nutrients throughout the body. The heart has 4 chambers that pump blood through arteries and veins. Blood vessels, veins, and arteries carry blood from the heart, deliver oxygen to cells, and return deoxygenated blood to the heart. Oxygen is divided by quality, arteries are known to carry good quality oxygen-rich blood from the heart to the body, while veins..