Crustaceans-Crab
These organisms have an antennal gland, located at their heads, and an maxillary gland, located on their backs, to help them urinate. Both these glands have a saclike covering and shape themselves into a bladder before completely opening these holes. They perform the same functions and help the crustacean to consume and eliminate urinary waste. Due to the fact that, these organisms are usually found in water, their glands and openings usually stay shut until the crustacean in ready to release its waste. |
Insects-Grasshopper
Insects such as these excrete urinary waste is a way that involves many processes in their bodies. In insects, body fluids are drawn into the Malphigian tubes, the insects's stomach-like area, by osmosis due to the high concentration of postassium in the tubule. The fluids pass through the body reaching the pores and digestive tracts, water is reabsorbed, and the urinary waste leaves the body through the abdomen area usually in the anus. |
Arachnids-Spider Spiders and other arachnids have special structures to get rid of their nitrogenous waste. These types of organisms do not produce urine like we do. Instead they produce uric acid, which is near solid and dissolves in water. This is because they cannot afford to lose and decrease their internal water contents like we can. This acid moves through the Malphigian tubule, which act similar to human kidneys, into the stercoral pocket, a pouchlike sac in the digestive tract, and leaves the body together with other wastes through the anus. |