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In respiratory physiology
Respiratory physiology

Respiratory physiology is the branch of human physiology focusing upon Respiration .Topics include:...
, ventilation (or ventilation rate) is the rate at which gas enters or leaves the lung
Lung

The lung is the essential respiration organ in air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located in the chest on either side of the heart....
. It is categorised under the following definitions:








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In respiratory physiology
Respiratory physiology

Respiratory physiology is the branch of human physiology focusing upon Respiration .Topics include:...
, ventilation (or ventilation rate) is the rate at which gas enters or leaves the lung
Lung

The lung is the essential respiration organ in air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located in the chest on either side of the heart....
. It is categorised under the following definitions:

Measurement Symbol Equation Description >- | Minute ventilation = tidal volume
Tidal volume

Tidal volume is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied....
 * respiratory rate
Respiratory rate

Respiratory rate is the number of breaths a living being, such as a human, takes within a certain amount of time .There is only limited research on monitoring respiratory rate, and these studies have focused on such issues as the inaccuracy of respiratory rate measurement and respiratory rate as a marker for respiratory dysfunction....
 		- | Alveolar ventilation = (tidal volume
Tidal volume

Tidal volume is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied....
 - dead space
Dead space

In physiology, dead space is air that is inhaled by the body in Breath, but does not take part in gas exchange.In adults, it is usually in the range of 150 mL....
) * respiratory rate
Respiratory rate

Respiratory rate is the number of breaths a living being, such as a human, takes within a certain amount of time .There is only limited research on monitoring respiratory rate, and these studies have focused on such issues as the inaccuracy of respiratory rate measurement and respiratory rate as a marker for respiratory dysfunction....
  		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
Dead space

In physiology, dead space is air that is inhaled by the body in Breath, but does not take part in gas exchange.In adults, it is usually in the range of 150 mL....
 * respiratory rate
Respiratory rate

Respiratory rate is the number of breaths a living being, such as a human, takes within a certain amount of time .There is only limited research on monitoring respiratory rate, and these studies have focused on such issues as the inaccuracy of respiratory rate measurement and respiratory rate as a marker for respiratory dysfunction....
 		is the volume of gas per unit time that does not reach these respiratory portions, but instead remains in the airways (trachea
Vertebrate trachea

The traceartes, or windpipe, is a tube that has an inner diameter of about 20-25 mm and a length of about 10-16 cm in humans. It commences at the larynx and bifurcates into the primary bronchus in mammals, and from the pharynx to the syrinx in birds, allowing the passage of air to the lungs....
, bronchi, etc.).


Sample values


Measure Sample value
Tidal volume
Tidal volume

Tidal volume is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied....
 0.5 L
Respiratory rate
Respiratory rate

Respiratory rate is the number of breaths a living being, such as a human, takes within a certain amount of time .There is only limited research on monitoring respiratory rate, and these studies have focused on such issues as the inaccuracy of respiratory rate measurement and respiratory rate as a marker for respiratory dysfunction....
 15 breaths/minute
Minute ventilation
Respiratory minute volume

Respiratory minute volume is the volume of air which can be inhalation or exhalation from a person's lungs in one minute. This is normally registered when a person has a ventilator supporting the person's breathing due to a sickness or injury....
 7.5 L/min
Dead space
Dead space

In physiology, dead space is air that is inhaled by the body in Breath, but does not take part in gas exchange.In adults, it is usually in the range of 150 mL....
 0.1667 L
Dead space ventilation 2.5 L/min
Alveolar ventilation 5.0 L/min

See also

  • Gas exchange
    Gas exchange

    Gas exchange or respiration takes place at a respiratory surface?a boundary between the external environment and the interior of the body....
  • Fowler method
    Fowler method

    Fowler's method, or the nitrogen washout method, is a way of measure dead space in the lung during a respiratory cycle. A subject takes a breath of 100% oxygen and exhales through a one-way valve measuring nitrogen content and volume....


External links

  • at rtcorner.net