Obligate nasal breathing

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Certain nasal breathing describes the physiological need for breathing through the nose (or any other external nares, depending on the species) contrary to the mouth. This term can be misleading, because it implies that the animal has no choice but to breathe through its nose; However, this is usually used to describe cases where effective mouth-to-mouth breathing is possible but not preferred. Alternatively, this term has been defined by some as the ability to breathe through the nose while swallowing. While this capability is a common feature of mandatory nasal breathing, it is clear that this definition does not require that the nose breathe in any way becomes an obligation to the animal. Even on mandatory nose breaths such as horses, rabbits, and rodents, there are potential pathways for air to travel from mouth to lungs that can be used for endotracheal intubation. It has been suggested that mandatory respiratory breathing is a very useful adaptation to prey species, as it allows animals to feed while maintaining their ability to detect predators with aromas.

Video Obligate nasal breathing

Man

Human infants are generally described as mandatory nasal breathing because they prefer to breathe through their nose rather than mouth. Most babies, however, can breathe through their mouth if their nose is blocked. However there are certain infants with conditions such as choanal atresia where death has resulted from nasal obstruction. In this case there is a cyclical period of cyanosis. Babies initially try to breathe through the nose, and can not afford; hypercapnia occurs, and many babies instinctively begin to cry. When crying, the mouth vents occur and the cyanosis subsides. There is variation in the length of time until the baby begins to breathe orally, and some will never stop doing nasal breathing. It has also been suggested that infants may not be able to maintain oral breathing for significant periods of time, due to muscle weakness required to close the nasal airways and open the oral airway.

Maps Obligate nasal breathing

Other animals

Horses are also considered as mandatory nasal breathing. The term is more accurate on horses, because their normal anatomy prevents them from breathing orally. The epiglottis is located above the soft palate while the animal does not swallow, forming an airtight seal. Oral breathing can only occur with significant anatomical abnormalities or pathological conditions. For example, denervation of the vagal branches of the vagal fibers results in soft dorsal densal dys- casia (DDSP), and it has been suggested that this leads to clinical syndromes that may include oral breathing. However, significant respiratory dysfunction including airway obstruction is observed with DDSP, and animals can not function normally under these circumstances.

Rabbits and rodents also require nasal respiration. Like a horse, the normal anatomical position of the epiglottis causes it to move above the caudal lip of the soft palate, sealing the pharynx of the mouth from the lower airways. Even so, rabbits with upper airway disease will try to breathe through their mouths.

Many other mammals, such as cats, dogs, and adult humans, have the ability to breathe indefinitely through the oral or nasal cavity.

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References

src: www.journals.elsevierhealth.com

External links

• Laitman, JT; Crelin, ES; Conlogue, GJ (1977). "Epiglottic function in monkeys and humans". Yale Journal of Biology and Medicine . 50 (1): 43-8. PMCÃ, 2595319 . PMIDÃ, 403687.

Source of the article : Wikipedia