The entrance of trachea is guarded by ___
The windpipe is called the trachea. The epiglottis is a flag like structure that guards the opening of the trachea and closes the trachea that the time of swallowing food.
Entrance fees received by a club is treated as a _____
The opening of the bladder into the urethra is guarded by a ___________
The upper opening of the windpipe is guarded by a muscular flap called