A "tube" is normally defined as having two openings, one at each end.
They have two.
prietika
tracheal system
tracheal system
From the esophagus to the anus, the digestive is basically a tube very similar to other tubular organs in the body. All such tubular organs are composed of several tissue layers arranged around a lumen. In a "generic" tubular organ, these layers are as follows (from the lumen to the ablumenal layer).
The bladder has two main openings: the ureters, which are the tubes that carry urine from the kidneys to the bladder, and the urethra, which is the tube through which urine exits the body. In total, there are three openings when considering the bladder's anatomical structure: two ureteral openings and one urethral opening.
The Pharynx leads from the mouth to the esophagus and then down to the digestive tract.
has only a single openning
The digestive track is a long twisting tube from the mouth to the
The pharynx, also known as the throat, is a tube used by both the digestive and respiratory systems.
well it has a tube, and that tube is within a tube. therefore, the tube is somehow within the tube. that explains it
The Esophagus