Which of the following structures are tubes?
A. Frontal, maxillary, sphenoidal, ethmoidal
B. Eustachian, pharynx, bronchi
C. Cilia, adenoids, mucous, epiglottis
D. Apex, base, hilum
And your choice is? You could look each word up in a dictionary to help decide.
Sra
which of the following strutures are tubes?
A. eustachain, pharynx, bronchi
B. Frontal, Malillary, Sphenoidal, Ethmoidal
C. Apex,base, Hilum
D. Cilia, adenoids, mucous, epiglottis
To determine which of the given structures are tubes, let's go through each option.
A. Frontal, maxillary, sphenoidal, ethmoidal:
These structures are actually sinuses in the skull and not tubes. Sinuses are hollow spaces that are connected to the nasal cavity, but they are not tube-like structures.
B. Eustachian, pharynx, bronchi:
Out of these three, both the Eustachian tube and the bronchi are tubes.
- The Eustachian tube connects the middle ear to the back of the throat and helps equalize air pressure.
- The bronchi are the main passages that allow air to enter the lungs.
The pharynx, on the other hand, is not a tube. It is a muscular tube-like structure that connects the nasal cavity and mouth to the esophagus and larynx.
C. Cilia, adenoids, mucus, epiglottis:
Out of these options, only one is a tube, and that is the epiglottis. The epiglottis is a flap of cartilage that covers the entrance to the larynx (voice box), preventing food or liquid from entering the airway during swallowing.
Cilia are not tubes, but tiny hair-like structures that function in the movement of substances, such as mucus, along the respiratory tract.
Adenoids are actually part of the lymphatic system in the throat and do not have a tube-like structure.
Mucus is a slimy substance that lines various organs but is not itself a tube.
D. Apex, base, hilum:
None of these structures (apex, base, hilum) are tubes. They are anatomical terms used to describe specific regions or points of various organs or structures.
In conclusion, the correct answer is:
B. Eustachian, pharynx, bronchi