Body Systems There are 10 body systems, one of them is the Integumentary (skin). It is composed of hair, skin, nails, sence receptions and oil glands. Its functionis to protect from outside, to regulate the body temperature, to make synthesis of hormones & chemicals and is used as a sense organ. Another one is the Skeletal System (bones). It is made of about 206 bones, that are divided in tho categories: axial bones (in the body by itself) and apendicular bones (arms & legs). We have Joints too. Thei`re divided in Ball Socket (like elbow and shoulders) and sattle (fingers). This system`s function are movement, storage of minerals, blood formation, support of the body and protection of body parts.