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excretory是什么意思，excretory翻译
Excretory systems are essential for maintaining homeostasis in living organisms. They help to remove waste products and excess substances from the body, ensuring a stable internal environment. The excretory system can vary depending on the type of organism, but generally includes organs or structures responsible for the production, storage, and elimination of waste.
In humans, the excretory system is composed of several organs, including the kidneys, ureters, urinary bladder, and urethra. The kidneys are the main organs of the excretory system, filtering waste products, excess water, and electrolytes from the blood to produce urine. The urine is then transported through the ureters to the urinary bladder, where it is stored until it is eliminated from the body through the urethra.
One of the key functions of the excretory system is to regulate the balance of water and electrolytes in the body. The kidneys help to maintain proper fluid balance by adjusting the amount of water reabsorbed back into the bloodstream and the amount of urine produced. They also help to regulate the levels of important minerals such as sodium, potassium, and calcium, as well as the pH balance of the blood.
In addition to waste elimination and fluid balance, the excretory system also plays a role in maintaining blood pressure and blood volume. The kidneys produce and release the hormone renin, which helps to regulate blood pressure by constricting blood vessels and stimulating the release of aldosterone, a hormone that promotes the reabsorption of sodium and water in the kidneys.
Some diseases and disorders can affect the excretory system, leading to problems with waste elimination and fluid balance. For example, kidney disease can lead to a buildup of waste products and fluid in the body, causing symptoms such as fatigue, loss of appetite, and swelling. Conditions such as diabetes and high blood pressure can also affect the kidneys and lead to excretory problems.
In conclusion, the excretory system is vital for maintaining a healthy and stable internal environment in living organisms. It helps to remove waste products, regulate fluid balance, and maintain blood pressure and blood volume. Without a properly functioning excretory system, waste products would build up in the body, leading to serious health issues. Therefore, it is important to maintain good overall health and seek medical attention if any problems with the excretory system are suspected.