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 we chew food and our teeth break it down into smaller pieces. This food would end up in the small intestine and as it passes through the gastrointestinal tract, the food mixes with lots of digestive juices that break down the larger food that hasn't been broken down by the mouth. Once all of these foods have been broken down to the appropriate size, the body can absorb the food through the small intestine into the bloodstream which then carries the collected nutrients to the rest of the body. The wasted products would then pass through the large intestine and out of the body. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original EssayAll the organs that work with the digestive system are the salivary glands, the esophagus, the liver, the stomach, the gallbladder, the pancreas, the small intestine, and the large intestine. Salivary glands are known to secrete saliva that contains an amylase enzyme that breaks down carbohydrates into starch. The esophagus, known as the food pipe, transfers all food from the mouth to the stomach. The liver would secrete bile to emulsify fat and in the stomach chemical degradation occurs with acids and enzymes. Both 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 non-digestible waste would go into the large intestine and be turned into feces. The respiratory system consists of the airways, lungs and breathing muscles. As you inhale, your body picks up oxygen from your mouth or nose depending on where you are breathing from. Once your body absorbs oxygen, it passes through the windpipe, known as the windpipe. This filters the air so that harmful bacteria in the air cannot enter the body deeper. The oxygen then goes to the bronchi where it will be separated into 2 tubes that will enter each lung. It is known that the bronchi have tiny lined hairs along which germs and dust that have entered with oxygen accumulate. 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 from the lungs once oxygen enters the blood. 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 for energy. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay The cardiovascular system consists of the heart, lungs, and veins, arteries, and vessels. This system is responsible for the flow 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 and supply oxygen to the 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 are known to carry oxygen poor blood back to the heart.