Organs of the circulatory system are the heart, blood, and blood vessels (arteries and veins). The circulatory system interacts with other systems, such as the lungs (respiratory system), liver (digestive system), and kidneys (digestive system).
Skin, hair, nails, sweat and oil glands. Function: Serves as a barrier against infection and injury; helps to regulate body temperature; provides protection against ultraviolet radiation from the sun.
The immune system protects your body against foreign pathogens such as bacteria and viruses. The immune system has 3 lines of defense against foreign pathogens: 1. Physical and Chemical Barriers (Innate Immunity) 2.