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Created with Fabric.js 1.4.5 Histology Respiratory System The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe. Histology is the study of organ tissue of the body. Epithelial tissue thus serves both as a protective barrier for the body and as an active interface with the environment. The structural and functional integrity of this epithelium is vital for normal health. Red blood cells collect the oxygen fromthe lungs and carry it to the parts of the body where it is needed. Digestive System The human digestive system is a series of organs that converts food into essential nutrients that are absorbed into the body and moves the unused waste material out of the body. Salivary GlandsEsophagusLarge IntestineSmall IntestineRectumAnus The digestive tract, also known as the gastrointestinal (GI) tract, starts at the mouth, continues to the esophagus, stomach, small intestine, large intestine (commonly referred to as the colon) and rectum, and ends at the anus. The entire system from mouth to anus is about 30 feet (9 meters) long. Urinary System The urinary system also known as the renal system produces, stores and eliminates urine, the fluid waste excreted by the kidneys. The urinary system includes two kidneys, two ureters, the bladder, two sphincter muscles and the urethra.
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