The circulatory system (also known as the cardiovascular system) is a network of organs and tissues found in the human body and is vital to life. It uses blood to transport gases, nutrients, hormones, immune cells and heat around the body and removes waste products from the body. The circulatory system is made up of the heart, lungs, arteries, veins, and capillaries, all working in unison to transport blood throughout the body. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay Cellular respiration is a process in which cells in the body break down sugars into a form of energy (ATP stores) that can be used by muscles in the body. The process requires oxygen, and when muscles contract and use energy, one of the main waste products created is carbon dioxide. The circulatory system collects oxygen from the alveoli of the lungs and delivers it to the body tissues so that cellular respiration can be performed and returns deoxygenated blood (oxygen is used in cellular respiration) to the heart so that it can be pumped to the lungs again for oxygenation. While completing exercise, cellular respiration is the common process of breaking down sugar into a form that the cell can use as energy. Cellular respiration absorbs food and uses it to create ATP, (adenosine triphosphate), a chemical that the cell uses to produce energy. Usually, this method requires oxygen and is usually known as aerobic respiration, the equation for cellular respiration is glucose + oxygen. The term homeostasis refers to the tendency towards a relatively stable balance between interdependent elements, maintained by physiological processes, since the endocrine system plays an important role in homeostasis since hormones must regulate the activity of the body's cells, i.e. the release of hormones in the body the blood is controlled by a stimulus. During homeostasis, the body increases sweat production, heart rate, and respiratory rate to maintain a healthy homeostatic system. Homeostasis depends on the body's ability to detect or resist these changes. Through the performance of relevant exercises (jumping jacks), a clear increase in physical activity is evident, as the muscle cells breathe more than when the body is at rest. As your heart rate increases during exercise, the rate and depth of your breathing also increases, this is to ensure that more oxygen is absorbed into the bloodstream and more carbon dioxide is removed from the body. Furthermore, capillaries allow a gaseous exchange of oxygen and carbon dioxide because they surround the alveoli and have thin single-celled walls that facilitate the process of gas diffusion. When blood arrives in the alveoli with a higher CO2 concentration and a lower oxygen concentration (produced as a result of cellular respiration) it diffuses through the capillaries with alveolar air, which has a much lower CO2 concentration and a higher oxygen concentration. This means that there is a concentration gradient that allows CO2 to diffuse from the blood into the alveolar air. Because alveolar air has a higher concentration of oxygen, oxygen diffuses into the blood through the capillaries, combining with hemoglobin in red blood cells to form oxyhemoglobin. The blood is now rich in oxygen and is again ready for cellular respiration. Please note: this is just a sample. Get a custom paper from our expert writers now..