Structure of Organ Systems

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Cardiovascular system The cardiovascular system consists of our heart (left and right ventricle, left and atrium, aorta, tricuspid valves, semi-lunar valves, vena cava, pulmonary artery and pulmonary vein), blood and blood vessels (renal artery, hepatic artery, renal vein and hepatic vein). The cardiovascular system is responsible for transporting nutrients and removing gaseous waste from the body. Digestive system The digestive system consists of the stomach, pancreas, liver, small intestine (duodenum, ileum and jejunum) and the colon (ascending colon, transverse colon, descending colon and sigmoid colon). The digestive system is used for digesting foods to a soluble form for the small intestine to absorb the minerals and vitamins and then what is left of the food is transported to the colon for water reabsorption and then excreted through the anus. Endocrine system The endocrine system is the system of glands, each of which secretes different types of hormones directly into the bloodstream to maintain homeostasis. Hormones regulate various human functions, including metabolism, growth and development, tissue function, sleep, and mood. Immune system The immune system is a system of biological structures and processes within an organism that protects against disease. The immune system detects an unknown pathogen and starts to break it down and create antigens to prevent it causing disorders within the body in the future. Our immune system consists of tonsils, adenoids, lymph nodes, appendix (no longer needed when grown up), lymphatic vessels, thymus, bone marrow and our spleen. Lymphatic system The lymphatic system is part of the circulatory system, comprising a network of conduits called lymphatic vessels that carry a clear fluid called lymph directionally towards the heart. Lymphatic organs play an important part in the immune system,

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