Chapter 7 Flashcards
alveoli
saclike structures that facilitate gas exchange in the respiratory zone.
Boyles Gas Law
gas law states that at a given constant temperature, pressure and volume are inversely proportional to each other.
Expiration
(usually) passive process of breathing out air.
External Respiration
physiological process of gas exchange between lungs and pulmonary capillary blood.
Internal Respiration
physiological process of gas exchange between the blood and body tissues.
Pulmonary ventilation
breathing, is the process by which a person moves air into and out of the lungs.
respiratory pump
assists with venous return when a person changes intra-abdominal and intrathoracic pressures by breathing in and out
Residual volume
volume of air left in the lungs after a person has exhaled as much as possible.
Total lung capacity
= vital capacity + residual volume
vital capacity
The maximal amount of air that a person can exhale after a maximal inhalation
spirometry
Lung volumes, capacities, and flow rates are measured using a technique
tidal volume
volume of air entering and leaving the lungs during quiet breathing
respiratory membrane
structure in the lungs that is composed of the alveolar wall, the capillary wall, and their respective basement membranes
Dalton’s law
total pressure of a mixture of gases (like atmospheric air) equals the sum of the partial pressures of the individual gases in the mixture.
Fick’s law
states that the rate of gas diffusion through a tissue (like the respiratory membrane) is proportional to the surface area and the gas partial pressure gradient.
Henry’s Law
states that gases dissolve in liquids in proportion to their respective partial pressures
oxygen diffusion capacity
- rate at which oxygen can diffuse from the alveoli into the blood.
- expressed as the volume of oxygen that diffuses through a membrane per minute per 1 mmHg of pressure difference.
pulmonary diffusion
When gases move across the respiratory membrane and are exchanged between the alveoli and the pulmonary capillary blood