Essay On Excretory System

Introduction

Our bodies produce waste, as does most of what we consume, the excretory system is responsible for removing this waste. It is essential that is waste is removed, or excreted, in order for the body to remain healthy. The human excretory system includes the liver, the kidneys, the large intestine, and the skin.

Part 1: What Does the Excretory System Do?

The excretory system is one of the most important systems in our bodies, as it excretes all the waste that would otherwise build up inside the body and eventually lead to your untimely demise. The Excretory system refers to the urinary system, which removes waste from our bodies as urine. The excretory system also refers to the large intestine, where sold wastes pass through, the lungs, which remove carbon dioxide, and the kidneys, which eradicate a lot of the liquid waste inside our bodies. Some liquid waste also evaporates from the skin, or it leaves through the lungs (which can be seen on cold days).

Part 2: How Does the
Urea is produced when your body breaks down food rich in protein, it is then carried in the blood stream to the kidneys which removes it from the blood. The urea is removed from the blood by miniscule filtering units within the kidney called nephrons. Urea, along with water and other waste substance, forms urine as it passes through the nephrons and down the renal tube to the kidney. From the kidney the urine passes down two thin tubes (called ureters) to the bladder. Ureters are constantly tightening and relaxing in order to force the urine away from the kidney, if this process does not take place and the urine remains in the kidney, an infection can occur. Small amounts of urine are released into the bladder from the ureters, which stores is until a trip to the bathroom is required. Circular muscles called sphincters help to keep the urine from leaking, and nerves in the bladder tell you when it’s time to