Worms use their skins for excretion mostly.
lungs
The function of the excretory system is called excretion. Excretion is the process of discharging the body's wastes.
The organ that excretes Urea compounds are the kidneys, BUT they do not excrete HEAT. No organ of the human body EXCRETES heat.
While not considered part of the endocrine system, the liver produces more hormones than any other organ in the body. As a side note the liver performs 500 different functions including hormone production.
which organ system regulates body functions by means of electrochemical impulses
integumentary, muscular, and skeletal systems
in a cell different cell organelles do different functions(e.g. mitochondria-respiration) in the same way our body has different organs or different organ systems to do different functions(heart-respiration;digestive system-complete digestion and excretion of food)
The function of the excretory system is called excretion. Excretion is the process of discharging the body's wastes.
It is major organ that eliminates nitrogenous wastes from body .
the lungs
The skin is the largest organ, it is called the external organ, it helps control body temp.
In human body, the excretion is necessary.there are some organ which perform this function eg.Kidney which filter urea from blood,urea is a nitrogenous waste which is harmful for human body. There are some other organ which involve in excretion in invertebrate like malpighian tubles and in earthworm by nephridia.