Multiple choice

The lower respiratory tract consists of trachea, bronchi, bronchioles, lungs and ____ within the lungs.

  1. mucus

  2. cilia

  3. alveoli

  4. ribcage

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lower respiratory tract includes the trachea, bronchi, bronchioles, and the lungs, which contain the alveoli where gas exchange occurs.