What Is the Excretory System?

The excretion system means that the animal body continuously produces waste that cannot be reused or even toxic during metabolism. At the same time, when the animal ingests food, it takes too much water, salt and some toxic substances into the body, and these substances must be continuously excreted from the body. The physiological process of transporting end products of substance metabolism, excess substances and substances not needed by the body to the excretory organ through the blood circulation, and excreting the body, is called excretion. This process is mainly done by the kidneys forming urine. The excretory system has the function of regulating the body's water and salt metabolism and acid-base balance while maintaining the relative stability of the body's environment while urinating.

Excretion system

The animal body continuously produces waste that cannot be reused or even toxic during the metabolism. At the same time, when the animal ingests food, it consumes too much water, salt and some toxic substances.

The urinary system of birds is special. Birds have no bladder (except for ostriches). The ureter is short. After the ureter is emitted from the kidney, it opens directly into the cloaca, so the bird's urine and feces are discharged from the cloaca. The bird urinates at the same time, the white part is the bird's urination. This is because the bird's body does not have a bladder that accumulates waste water. Therefore, its urine is excreted along with the stool. Birds' kidney tubules and cloacas have the function of reabsorbing water, reducing water loss in the body. The bird's body structure is based on being able to fly in the air to make the body as light as possible. The bird has no bladder to keep the body light. The often flying bird has a shorter "gut" that absorbs food nutrients. Therefore, after it absorbs the nutrients of the food it eats, useless things can be quickly excreted from the body with little time.