Final answer:
The first bifurcation of the trachea is called the carina.
Step-by-step explanation:
The first bifurcation of the trachea, where it splits into the right and left primary bronchi, is called the carina. The carina is a raised structure located at the lower end of the trachea. It contains specialized nervous tissue that induces coughing if a foreign body, such as food, is present.