Why do all animals have special excretory organs?

Ammonia (NH3) is a toxic cellular waste from the metabolism of amino acids. Animals have evolved excretory organs such as nephridium or kidneys to rid tissues of ammonia as well as other metabolic wastes. read more

Compared to animals, plants do not have a well-developed excretory system to throw out nitrogenous waste materials. This is because of the differences in their physiology. Therefore, plants use different strategies for excretion. read more

Vertebrates Have Paired Kidneys | Back to Top. ALL vertebrates have paired kidneys. Excretion is not the primary function of kidneys. Kidneys regulate body fluid levels as a primary duty, and remove wastes as a secondary one. The Human Excretory System | Back to Top. The urinary system is made-up of the kidneys, ureters, bladder, and urethra. read more

The lungs use cells known as alveoli to remove the carbon dioxide from our blood. Otherwise, the carbon dioxide would accumulate and have a detrimental effect to our body. Accessary Excretory System Organs 1. Liver. Although considered a secondary, or accessary excretory system organ, the liver plays a vital part in keeping the body clean. read more