Part 1 of Essay
There are 10 , 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 m ....

Part 2 of Essay
.... maintain body posture & tone and in the production of body heat. Now its time for the Nervous System. Its constructed of the brain, the spinal cord and the nerves (neurons). Its functions are to communicate (fast with short duration), integration, and to control. The subsequent system is the Endocrine System (known as ductless too...). This is composed of a lot of things... They are:pituitary gland - below the brain (master gland), pineal gland - brain (It`s called the "third eye" by some, because its sensitive ....