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23 sty 2023 · Ventilation (V) refers to the flow of air into and out of the alveoli, while perfusion (Q) refers to the flow of blood to alveolar capillaries. Individual alveoli have variable degrees of ventilation and perfusion in different regions of the lungs.
15 mar 2020 · Ventilation is the process by which oxygen and CO 2 are transported to and from the lungs. The physics of breathing are based on Boyle’s law. The key anatomical structures involved in ventilation include the lungs, diaphragm, rib cage and external intercostal muscles.
Air flows out of the lungs during expiration based on the same principle; pressure within the lungs becomes greater than the atmospheric pressure. Pulmonary ventilation comprises two major steps: inspiration and expiration.
16 lip 2023 · Expiration is the phase of ventilation in which air is expelled from the lungs. It is initiated by the relaxation of the inspiratory muscles: Diaphragm – relaxes to return to its resting position, reducing the superior/inferior dimension of the thoracic cavity.
31 sie 2023 · In the medical world, breathing is defined as pulmonary ventilation, described as the movement of air between the atmosphere and the lung alveoli . It involves two events: inspiration, when the air moves into the lungs and expiration, when the air leaves the lungs.
30 sie 2020 · Air flows out of the lungs during expiration based on the same principle; pressure within the lungs becomes greater than the atmospheric pressure. Pulmonary ventilation comprises two major steps: inspiration and expiration.
Explain how pulmonary ventilation is affected by bronchiolar smooth muscle contractions (bronchoconstriction), lung and thoracic wall compliance, and pulmonary surfactant and alveolar surface tension.
