Protection

• The immune system provides a mechanism for the body to carry out the following: (1) distinguish its own cells from harmful foreign cells and substances; and (2) destroy the invader by phagocytosis or by producing sensitized lymphocytes or specialized proteins (e.g., antibodies ) that destroy or neutralize the invader.
• Integumentary System is the skin and its various appendages (including the hair, nails, glands, and other structures) that cover, cushion, and protect the deeper tissues and organs of the body and generally provide a boundary between the body’s internal environment and the outside world. The integumentary system is also important for temperature regulation and excretion of wastes, and it provides a sensory interface between the body and the external environment.