These one-way 'doorways' are called valves. They exist in places such as the heart and the oesophagus/stomach opening.
The epiglottis is what acts as a lid over the entrance of the laryngopharynx. This is defined as a flap that is made of elastic cartilage tissue that is covered with a mucous membrane.
glottus
Heart valve.
the small flap is called the Epiglottis :)
The epiglottis is very short, and fits right over the esophagus. It is a small flap of flexible cartilage tissue that protects the windpipe.
There are so many answers to that question. The uvula acts kind of like a door as well as any of the sphincters. The valves of the heart act like little doors also.
The epiglottis is what acts as a lid over the entrance of the laryngopharynx. This is defined as a flap that is made of elastic cartilage tissue that is covered with a mucous membrane.
a flap of tissue that prevants blood from flowing backward is
bronchi
A cat flap is at the bottom of a door and it is used for cats to get in and out of the house instead of having to open the door every time.
The epiglottis
Epiglottis
The epiglottis is the flap of tissue that covers the trachea during swallowing to prevent food and liquid from entering the airway. It acts as a protective barrier, ensuring that these substances are directed towards the esophagus instead of the lungs.
which of these is a flap that shut off the passage to the trachea and lungs
no
the sopranus
Epiglottis