Respiratory Gas Exchange in the FleaXenopsylla conformis(Siphonaptera: Pulicidae)

Respiratory Physiology: Gas Exchange and Respiratory Mechanics

Respiration provides oxygen (O2) and removes carbon dioxide (CO2) for the body. An extraordinary anatomic arrangement of functional units (the alveoli) delimited by extra-thin walls (epithelium and endothelium) creates the interface for gas exchange between air and blood. Repetitive expansion and collapse of the chest wall facilitates movement of gas in and out of the lungs. This review focuses...

Respiratory Structures and Gas Exchange

The lungs move air in and out like bellows. Fresh, oxygen-rich air mixes with intrapulmonary air. Oxygen is carried with the circulation and carbon dioxide is excreted with the exhaled air. Various mechanisms maintain the purposeful distribution of ventilation and circulation. Very much of the complicated physiology and pathophysiology is already known, and it has recently become possible to ob...

Update on Respiratory Physiology: Pulmonary Gas Exchange

Respiratory gas exchange using a triaxial alveolar gas diagram.

A triaxial alveolar gas diagram to depict fractional concentration of oxygen, carbon dioxide and nitrogen is described, in which the R = 1 line is always implicit. Although it is not claimed that this representation leads to new insights into respiratory physiology, a method of plotting on a triaxial coordinate system has been found to be well suited to many applications when a direct display o...

Respiratory gas exchange indices for estimating the anaerobic threshold.

Several methods are used for estimating the anaerobic threshold (AT) during exercise. The aim of the present study was to compare AT values based on blood lactate measurements with those obtained from computerised calculations of different respiratory gas indices. Twelve healthy, well-trained men performed a stepwise incremental test on both treadmill and cycle ergometer. Respiratory gases were...