The Mechanism of Ventilation and Breathing Measurements (OCR A-Level Biology A): Flashcards
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Ventilation purpose
Ventilation purpose
Keeps air in alveoli fresh; maintains concentration gradients
Pressure-volume relationship in breathing
Pressure-volume relationship in breathing
Inverse: volume increases → pressure decreases
Inspiration - active or passive?
Inspiration - active or passive?
Active process
Diaphragm action during inspiration
Diaphragm action during inspiration
Contracts and flattens, moving downward
Normal expiration at rest
Normal expiration at rest
Passive process - muscles relax, lungs recoil
Vital capacity
Vital capacity
Max volume of air breathed in/out in a single breath
Tidal volume
Tidal volume
Volume of air breathed in/out during quiet breathing at rest
Residual volume
Residual volume
Air that always remains in lungs after forceful exhalation
Stretch receptors role
Stretch receptors role
Detect lung expansion; provide negative feedback to brain
Soda lime purpose in spirometer
Soda lime purpose in spirometer
Absorbs/removes carbon dioxide from re-breathed air