Consider the following statements regarding the functions of the Integumentary System in animals.  I. It helps in the regulation of body temperature in animals.  II. It is a site for the synthesis of cholecalciferol.  III. It is the attachment site for the sensory receptors that are used for detection of various sensations such as pain, sensation, pressure etc.  Which among the above is/are the function(s) of the integumentary system in animals?

Option 4 : All I, II and III 

The integumentary system has a variety of functions in the animals:

• It protects the animal body from damages such as loss of water and any other external damage. 
• It acts as a site for the synthesis of Vitamin D (Chole-Calciferol) in case of most of the vertebrates which are exposed to sunlight. 
• It helps in the regulation of body temperature in most of the animals. 
• It helps in the excretion of waste also from the body. 
• It acts as an attachment site for various sensory receptors used for detection of various sensations such as pain, pressure etc. 
• It contributes to protecting the deeper tissues in the animal body in most of the cases.