Welcome to the electronic classroom of the 21st century for advanced human anatomy and physiology. The skin is the primary organ of the integumentary system and it is th largest organ of the human body. Forming the outer protective covering of the body, the skin is a continuous sheet of cutaneous membrane. You have an unlimited number of attempts to aid in learning and test-taking skills. Each attempt will generate a different set of questions and answers. I wish you very high grade on this laboratory exercise based summary test.