How did the digetive systerm and the circulatory systerm work together?

Answer 1

The process of producing and delivering energy to the cells of the body shows the interconnected relationships that exist with the systems of the body. The digestive and circulatory systems work together to ensure the body has enough fuel to serve the body's needs. Other systems of the body such as the endocrine and respiratory systems also participate in different roles.

DigestionDigestion begins as soon as you start eating. Enzymes in your saliva start the process of converting food into energy. Food will then travel to the stomach via the esophagus. There, digestion continues for another two to six hours, depending upon the type of food you ate. This process reduces food into molecules that the body can then use for producing energy. Most nutrient absorption occurs in the small intestine, while water absorption occurs in the large intestine.

Your body relies primarily on carbohydrates and fats from the foods you eat for energy. The blood transports these chemicals to the cells of your body through the circulatory system. Within the cells are organelles called mitochondria. This is where energy production occurs through a complex series of chemical reactions to produce ATP, the energy currency of the body. The circulatory system will also ensure that the cells have adequate oxygen. Red blood cells contain a specialized protein called hemoglobin which will fulfill the body's requirements.

AdaptationsYour body can produce energy with or without the presence of oxygen. However, the former provides a richer source of ATP. To keep your body supplied with energy and oxygen, your circulatory system can divert blood flow as needed. When you are inactive, about 15 to 20 percent of your blood exists within muscle tissue. If you exercise strenuously, blood flow increases to 80 to 85 percent. This change happens so that your body can keep up with the needs for fuel and oxygen as well as remove waste products and carbon dioxide. Food and EnergyThe energy provided by the foods you eat is measured in calories. A gram of fat will provide nine calories, whereas both proteins and carbohydrates contain four calories. Availability will determine which source your body turns to for energy. However, during moderate activity at 60 to 80 percent of your maximum heart rate, your body will be in its maximum fat-burning zone, explains a 2009 study by the University of St Thomas in Minnesota. Your maximum heart rate is 220 minus your age. Fat provides more fuel, but it takes more energy to break the chemical bonds of fat molecules. During vigorous activity, the body relies more on carbohydrates because they are easier to metabolize for quick energy.

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