Question

which is a flap of tissue that folds down to close off the entrance to the larynx and trachea when you swallow?
answers: a - d
a epiglottis
b alveolus
c alveoli
d diaphragm

Explanation:

To solve this, we analyze each option:

• Option A: The epiglottis is a flap of tissue that closes the larynx/trachea entrance during swallowing to prevent food from entering the respiratory tract.
• Option B: Alveolus (singular of alveoli) is a tiny air sac in the lungs for gas exchange, not related to swallowing.
• Option C: Alveoli are the plural of alveolus, also for gas exchange, not involved in swallowing.
• Option D: The diaphragm is a muscle for breathing (aids in inhalation/exhalation), not related to closing the larynx/trachea during swallowing.

Answer:

A. epiglottis