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.
In the first line of defense, the body has barriers that prevent pathogens from entering your bodyâs cells in the first place. These barriers act to trap and kill most pathogens and include the surfaces of the skin, breathing passages, mouth, eye and stomach chemicals and others.. Complete the table to show the three different ways the body keeps out pathogens: How It Works Skin Breathing passages Mouth Stomach 3. The second line of defense in the body is called the _________________________. 4. Describe what happens in this response: 5.