Which organ is responsible for excreting sweat?
 

The organ responsible for excreting sweat is the skin. 

The skin is an important part of the excretory system as it helps in regulating body temperature and removes waste products like excess water, salt, and small amounts of urea through sweat. Sweat is produced by sweat glands in the skin and is composed of water, salt, and small amounts of other substances. When the sweat evaporates from the skin, it cools down the body and removes waste products. Therefore, skin plays a crucial role in the excretion process.