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the digestive system takes in and uses food. this food is broken down. when broken down a part of it is called glucose and is used for respiration. respiration produces energy, CO2 and water. the energy is used by the entire body. the heart also uses it to pump blood around the body. this is the connection between the digestive and circulatory system. The common factor is the delivery of nutrients and prerequisites of metabolism to the different parts of the body and the removal of by products of metabolism out of the body. Without oxygen and food we would die and in the absence of excretion of urea and carbon dioxide we would die from the toxic effects of our own waste. How do the circulatory system digestive system and respiratory system work together in the body? In: Human Physiology The Respiratory System The primary function of the respiratory system is to supply oxygen to all of the cells of the body. However, the because the respiratory organs themselves do not reach to every cell of the body, the respiratory system interfaces with the circulatory system. The respiratory system also works to expel carbon dioxide from the body. If carbon dioxide accumulates in the body, it can react with water to form carbonic acid, which is harmful to body tissues. _______________________________________________________________________ What is the relation between the digestive and respiratory system? In: Human Anatomy The respiratory system function to keep the relative concentrations of carbon dioxide and oxygen where they should be. This is seen by the body as the blood pH, as CO2 levels rise, blood pH decreases. This drives the the rate of respiration which flushes the body of CO2. However, if the source of H+ is from ingested food the acid-base balance depends on the excretion of excess H+ via the digestive system. Probably the most important is the oxygen that is supplied to the smooth muscles that move the food through by tonic and peristaltic contractions. How does the urinary system work? Front view of urinary tract. Your body takes nutrients from food and uses them to maintain all bodily functions including energy and self-repair. After your body has taken what it needs from the food, waste products are left behind in the blood and in the bowel. The urinary system works with the lungs, skin, and intestines—all of which also excrete wastes—to keep the chemicals and water in your body balanced. Adults eliminate about a quart and a half of urine each day. The amount depends on many factors, especially the amounts of fluid and food a person consumes and how much fluid is lost through sweat and breathing. Certain types of medications can also affect the amount of urine eliminated. The urinary system removes a type of waste called urea from your blood. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys. The digestive system. The digestive system is made up of the digestive tract—a series of hollow organs joined in a long, twisting tube from the mouth to the anus—and other organs that help the body break down and absorb food (see figure). Organs that make up the digestive tract are the mouth, esophagus, stomach, small intestine, large intestine—also called the colon—rectum, and anus. Inside these hollow organs is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. The digestive tract also contains a layer of smooth muscle that helps break down food and move it along the tract. Two “solid” digestive organs, the liver and the pancreas, produce digestive juices that reach the intestine through small tubes called ducts. The gallbladder stores the liver’s digestive juices until they are needed in the intestine. Parts of the nervous and circulatory systems also play major roles in the digestive system. CIRCULATORY SYSTEM URINARY SYSTEM DIGESTIVE SYSTEM RESPIRATORY SYSTEM