Ventilation (physiology)

Ventilation (physiology)
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ventilation_(physiology)".

For other uses, see Ventilation.

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:

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Measurement	Symbol	Equation	Description
Minute ventilation	$\dot{V}$	= tidal volume * respiratory rate^[1]^[2]	the total volume of gas entering the lungs per minute.
Alveolar ventilation	$\dot{V}_A$	= (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	$\dot{V}_D$	= 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.).

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External links

MeSH Pulmonary+ventilation
RT Corner (Educational Site for RT's and Nurses) at rtcorner.net

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

Volumes	lung volumes - vital capacity - functional residual capacity - respiratory minute volume - closing capacity - dead space - spirometry - body plethysmography - peak flow meter - thoracic independent volume

Airways	ventilation (V) (positive pressure) - breath (inhalation, exhalation) -respiratory rate - respirometer - pulmonary surfactant - compliance - hysteresivity - airway resistance - bronchial hyperresponsiveness - bronchial challenge test

Blood	pulmonary circulation - perfusion (Q) - hypoxic pulmonary vasoconstriction - pulmonary shunt

Interactions	ventilation/perfusion ratio (V/Q) and scan - zones of the lung - gas exchange - pulmonary gas pressures - alveolar gas equation - alveolar-arterial gradient - 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)

Insufficiency	high altitude - oxygen toxicity - hypoxia

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References

External links