How do the respiratory system and the lymphatic system interact?

The respiratory system and the lymphatic system interact primarily in immune defense and fluid balance. The respiratory system facilitates gas exchange and helps trap pathogens and particulates in the airways, while the lymphatic system helps remove these pathogens through lymph nodes, where immune responses are initiated. Additionally, the lymphatic system drains excess fluid from tissues, including those in the lungs, helping to maintain proper fluid balance and support respiratory function. Together, they play a crucial role in protecting the body from infection and maintaining homeostasis.