The main process of excretion takes in the
nephrons of the kidneys. These are tiny structures that filter waste products and excess substances from the blood to form urine. The waste products and excess substances are then transported through the ureters to the bladder, where they are stored until they are released from the body through the urethra.
In addition to the kidneys, other organs involved in the excretion process include the liver, which helps remove toxins from the blood, and the lungs, which eliminate carbon dioxide through respiration. The skin also plays a role in excretion by releasing sweat, which contains waste products such as urea and salts.
Overall, the excretion process helps maintain the body's internal environment by removing waste products and regulating the balance of essential substances such as water and electrolytes.