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
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.
The epiglottis
Epiglottis
which of these is a flap that shut off the passage to the trachea and lungs
A cat flap is a small opening in a door or wall that allows a cat to enter and exit a house freely. It often has a hinged flap that the cat can push open with its nose or paw.
no
the sopranus
Epiglottis