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Excretory System
The excretory system is a group of organs responsible for removing metabolic waste products from the body and maintaining internal balance (homeostasis). It is not limited to the kidneys alone.

Lungs
The lungs remove gaseous waste from the body, mainly:
Carbon dioxide (CO₂)
Water vapor
They also help regulate the acid–base balance of the blood.

Liver
The liver plays a major role in detoxification:
Converts toxic ammonia into urea
Detoxifies drugs and harmful substances
Eliminates waste products through bile
The liver prepares waste materials for excretion by the kidneys or intestines.

Kidneys
The kidneys are the main excretory organs:
Filter the blood
Remove urea, creatinine, excess water, and salts
Produce urine
They also regulate blood pressure, electrolyte balance, and blood pH.

Skin (Sweat glands)
The skin, through sweat glands, helps excrete:
Water
Mineral salts
Small amounts of urea
It also plays an important role in temperature regulation.

Summary
The lungs, liver, kidneys, and skin work together to:
Remove waste products
Maintain homeostasis
Protect the body from toxic substances