The subcutaneous layer is beneath the dermis and consists mainly of a type of connective tissue called adipose tissue. Adipose tissue is more commonly known as fat and it helps cushion the skin and provide protection from cold temperatures. A cross-section of skin Epidermis Dermis Subcutaneous layer Organ Systems Organ systems are composed of two or more different organs that work together to provide a common function. The main role of the skeletal system is to provide support for the body, to protect delicate internal organs and to provide attachment sites for the organs. The main role of the muscular system is to provide movement.
Muscles work in pairs to move limbs and provide the organism with mobility.
Muscles also control the movement of materials through some organs, such as the stomach and intestine, and the heart and circulatory system. The main role of the nervous system is to relay electrical signals through the body. The nervous system directs behaviour and movement and, along with the endocrine system, controls physiological processes such as digestion, circulation, etc. The main role of the respiratory system is to provide gas exchange between the blood and the environment. Primarily, oxygen is absorbed from the atmosphere into the body and carbon dioxide is expelled from the body.