Hormone Signaling. The glands of the endocrine system secrete hormones directly into the extracellular environment. The hormones then diffuse to the bloodstream via capillaries and are transported to the target cells through the circulatory system.
Answer:
I think you answered your own question
Air passes from the trachea into the lungs through two large tubes called : Bronchi
Bronchi has the function to conducts air to the lungs (it somehow acts as an airway to the respiratory system)
hope this helps
