Structure: The respiratory system includes the nose, pharynx, larynx, trachea, bronchi, bronchioles, and alveoli. Air enters through the nose, travels down the trachea, branches into bronchi and bronchioles, and reaches the alveoli, where gas exchange occurs across tiny capillaries.
Function: The system performs two main roles:
* Gas exchange: Oxygen enters the bloodstream and carbon dioxide is removed.
* Temperature regulation: Breathing rate and depth help cool or warm the body.
A healthy respiratory system is essential for survival.