KINE 3012 Lecture Notes - Lecture 1: Tidal Volume, Gas Exchange, Trachea

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Alveolar ventilation: amount of air moved into/out of alveoli, gas exchange only in alveoli, expressed per minute rate, dot represents rate; not dot represents volume. Anatomic dead space: dead space effects alveolar ventilations, air in area where there"s no gas ex(cid:272)hange & not used is dead spa(cid:272)e (cid:894)tra(cid:272)hea(cid:895) Inhalation results in breath in 500ml from atmosphere into respiratory system: the first thing that comes in alveoli is dead air (old) & 350ml from atmosphere. Accounting for dead space: amount of air that gets to alveolus, tidal volume- dead space = total volume of air enters alveoli, only 70% of air breathed in enters lungs for gas exchange; rest is wasted. Dead space have big effect on gas exchange: effe(cid:272)ts how we (cid:271)reath, doesn"t (cid:272)hange, amount of air available for gas exchange va is not same as amount of air moved ve.

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