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.
T/F- The skin is the body's initial barrier to any outside invasion by pathogens; however, once the skin has been penetrated, the body's primary defense mechanism against infection and disease consists of the hormones that chemically attack any foreign invaders or antigens.