Ventilation (physiology)

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In respiratory physiology, ventilation (or ventilation rate) is the rate at which gas enters or leaves the lung. It is categorised under the following definitions:

Measurement	Equation	Description
Minute ventilation	= tidal volume * respiratory rate[1][2]	the total volume of gas entering the lungs per minute.
Alveolar ventilation	= (tidal volume - dead space) * respiratory rate [1]	the volume of gas per unit time that reaches the alveoli, the respiratory portions of the lungs where gas exchange occurs.
Dead space ventilation	= dead space * respiratory rate[3]	is the volume of gas per unit time that does not reach these respiratory portions, but instead remains in the airways (trachea, bronchi, etc.).

[edit] See also

• Gas exchange

[edit] References

1. ^ ^{a b} http://www.healthsystem.virginia.edu/Internet/Anesthesiology-Elective/airway/ventilation.cfm
2. ^ http://www.nda.ox.ac.uk/wfsa/html/u12/u1211_02.htm
3. ^ Physiology at MCG 4/4ch3/s4ch3_16

[edit] External links

• MeSH Pulmonary+ventilation

v • d • e Respiratory system, physiology: respiratory physiology

Volumes: lung volumes - vital capacity - functional residual capacity - respiratory minute volume - dead space - spirometry - body plethysmography - peak flow meter ventilation (V) (positive pressure) breath (inhalation, exhalation) - respiratory rate - respirometer - pulmonary surfactant - compliance - hysteresivity - airway resistance pulmonary circulation - perfusion (Q) - hypoxic pulmonary vasoconstriction - pulmonary shunt ventilation/perfusion ratio (V/Q) and scan - zones of the lung - gas exchange - pulmonary gas pressures - alveolar gas equation - hemoglobin - oxygen-haemoglobin dissociation curve (2,3-DPG, Bohr effect, Haldane effect) - carbonic anhydrase (chloride shift) - oxyhemoglobin - respiratory quotient - arterial blood gas - diffusion capacity - Dlco control of respiration: pons (pneumotaxic center, apneustic center) - medulla (dorsal respiratory group, ventral respiratory group) - chemoreceptors (central, peripheral) - pulmonary stretch receptors - Hering-Breuer reflex high altitude - oxygen toxicity - hypoxia