What is the field of study that focuses on the functions of the skin?

The field of study that focuses on the functions of the skin is physiology. Physiology examines the processes and functions that occur within living organisms, including how various systems and organs operate. In the context of the skin, physiology encompasses understanding how the skin protects the body, regulates temperature, and plays a crucial role in sensation and metabolism, among other functions.

While dermatology is the branch of medicine specifically focused on skin disorders and diseases, histology deals with the microscopic structure of tissues, and anatomy studies the structure and organization of living things. Hence, physiology is the most appropriate choice when discussing the functional aspects of skin processes and their significance in overall health and well-being.