An opening in the dermis through which perspiration reaches the surface of the skin is called

An opening in the dermis through which perspiration reaches the surface of the skin is called pores.

Explanation:

Skin is the second largest organ of the human body. The skin in order to regulate the body temperature expels the liquid in the form of sweat. This sweat is normally not pure water. It is a mixture of water with minerals and salts. This process is called as the perspiration.  Skin has got sweat glands which is present throughout the body.

This sweat gland through  the small holes called pores that expel the sweat. Normally we sweat through arm pits, face, palm of hands and sole of the foot. Women tend to sweat more than men. A normal pure sweat is odorless hence distinctive odor in the sweat can help us identify certain differences the body is undergoing .