The circulatory system is made of a network of vessels, each of which carries blood from the heart to other parts of the body. Pressure inside each vessel helps blood flow and this pressure is affected by the amount of water in the blood. The kidneys work to keep the amount of water in the blood in balance. Each kidney contains millions of nephrons, which are the basic filtering units of the kidney. The renal corpuscle is the part of the nephron that filters salt, water, and waste products out of the blood to create a fluid called filtrate. As the filtrate continues through the tubes of the nephron, most of the salt in the filtrate returns back into the blood. The salt acts as a magnet for the water, causing it to also return to the blood. The remaining fluid is then released as urine. However, sometimes too much salt and water return to the blood. As a result, the fluid volume in the blood vessels may increase, resulting in a condition known as high blood pressure. High blood pressure can strain organs which contain large supplies of blood vessels, including the heart, kidneys, and the eyes, eventually causing irreversible damage to these areas. Diuretics are drugs that help decrease blood pressure by lowering the volume of blood. They can work in the kidneys by blocking the exit of salt from the filtrate. As a result, more salt and water remain in the urine as it is removed from the body. This causes the volume of blood to decrease, which lowers the overall pressure. There are several types of diuretics which act in different parts of the kidneys. Diuretics are most commonly prescribed for people who have high blood pressure, edema and congestive heart failure, all of which are disorders that are caused by the presence of extra fluid in the body.
Scientific and Medical Animations
Copyright ©2017 ALL RIGHTS RESERVED