| Respiratory mechanics and control of the ventilatory cycle in the garter snake. | |
| | |
MedLine Citation:
|
PMID: 3704379 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
We measured respiratory airflow and intrapulmonary pressure in spontaneously breathing garter snakes (Thamnophis sirtalis) before and after bilateral vagotomy. Each breathing cycle consisted of expiration, inspiration, and a breath-holding period with the glottis closed, as previously reported. Respiratory system compliance was very high compared with that of mammals (0.042 ml/cm H2O per g), but was considerably reduced when the animal was coiled. Resistance to airflow averaged 6.35 cm H2O per ml/sec. Lung volume during the breath-hold was usually above the relaxed volume of the system. Analysis of dynamic pressure-volume and flow-volume loops showed that both expiration and inspiration were active, and that little use was made of passive recoil pressure in expiration. Evidence that vagally mediated, volume-related feedback influenced the breathing pattern was found in some snakes, but this influence was weaker than in most mammals and other reptiles. The results suggest that breathing in snakes is mainly a centrally programmed process, not markedly dependent on respiratory system mechanics or neuromechanical feedback. This arrangement is advantageous in view of the high, posturally variable compliance and the frequent regional distortions of the respiratory system that result from the unique structure of these animals. |
| | |
Authors:
|
D Bartlett; J P Mortola; E J Doll |
Related Documents
:
|
7944009 - Airway occlusion pressure and diaphragm global electromyogram analysis for evaluation o... 4069809 - Breathing pattern of neonates during nonnutritive sucking. 14608459 - Extubation failure: diagnostic value of occlusion pressure (p0.1) and p0.1-derived para... 3281649 - Assisted positive pressure breathing for augmentation of acceleration tolerance time. 11577909 - Modulation of respiratory sinus arrhythmia by respiration rate and volume: stability ac... 20522519 - Effect of exhaled moisture on breathing resistance of n95 filtering facepiece respirators. 8326659 - Efficacy and toxicity of differently charged polycationic protamine-like peptides for h... 17117139 - Intraperitoneal administration of hyperbarically oxygenated perfluorochemical enhances ... 19521419 - Prevention and regression of hypertension: role of renal microvascular protection. |
Publication Detail:
|
Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
|
Title: Respiration physiology Volume: 64 ISSN: 0034-5687 ISO Abbreviation: Respir Physiol Publication Date: 1986 Apr |
Date Detail:
|
Created Date: 1986-06-12 Completed Date: 1986-06-12 Revised Date: 2009-11-11 |
Medline Journal Info:
|
Nlm Unique ID: 0047142 Medline TA: Respir Physiol Country: NETHERLANDS |
Other Details:
|
Languages: eng Pagination: 13-27 Citation Subset: IM |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Airway Resistance Animals Female Glottis / physiology Lung / physiology* Lung Compliance Lung Volume Measurements Male Posture Pulmonary Ventilation Respiration* Snakes / physiology* Vagotomy |
| Grant Support | |
ID/Acronym/Agency:
|
HL-07449/HL/NHLBI NIH HHS; HL-19827/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Mitochondrial distribution in relation to changes in muscle metabolism in rat soleus.
Next Document: Effect of cold air on laryngeal mechanoreceptors in the dog.