The trachea (IPA tr'eik-i-a), or windpipe, is a tube extending from the larynx to the bronchi in mammals, and from the pharynx to the syrinx in birds, carrying air to the lungs. It is lined with ciliated cells which push particles out and reinforced with cartilage rings.
In ill or injured persons, the natural airway formed by the trachea may be damaged or closed off. Intubation is the medical procedure of inserting an artificial tube into the trachea to permit breathing. See also choking.
In insects, each segment of the body has a pair of spiracles, each of which has a trachea behind it. Air moves into these small tubes through the spiracles. These tracheae branch and supply air to the tissues, where oxygen is absorbed into the body. Insects do not carry oxygen in their blood, as do vertebrates; this limits their size.
The average trachea size for an adult Bulldogs is size 7 trachea, which is based on the size of the trachea tube used in surgery.
The higher number the wider the trachea is. However, it is impossible to determine exact size as many vets try and use a general (size 7 or 8) tube whne in fact maybe a 9 would have fit fine.
It's most important to do so, Trachea's in Bulldog are tricky, and one should be very well experienced when dealing with Bulldogs and surgery.
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