Follow Up Question 2 Compare Your Breath Hold Times For Trial 3 Maximal Exhalation And Trial 2 Maximal Inhalation 1 (63.88 KiB) Viewed 31 times
Follow Up Question 2 Compare Your Breath Hold Times For Trial 3 Maximal Exhalation And Trial 2 Maximal Inhalation 2 (63.88 KiB) Viewed 31 times
Follow-up Question 2: Compare your breath-hold times for Trial 3 (maximal exhalation) and Trial 2 (maximal inhalation). Typically, a person can hold their breath longer during Trial 2. (Note: Your results may have been different). What is the best explanation for why most people are normally able to hold their breaths longer during Trial 2 versus Trial 3? O The lung volume is larger during Trial 2, which allows more oxygen to be stored in the lungs during the breath- hold. The production of CO₂ from the body's tissues was lower in Trial 2, allowing more time to elapse before arterial Pco2 built up to the critical level triggering people to breathe. O During a breath-hold, as arterial Pco2 builds up, the lungs act as a sort of CO₂ reservoir, taking in excesses CO₂ as it diffuses out of the blood. The larger lung volume in Trial 2 meant a larger CO₂ reservoir, causing more time to elapse before Pco2 built up to the critical level in the arterial blood and triggering people to breathe. O During Trial 3, the maximal exhalation caused people to blow off more CO₂ before they held their breath compared to Trial 2. As a result, the arterial Pco2 levels were lower at the start of the breath-hold during Trial 3, causing more time to elapse before Pc02 built up to the critical level in the arterial blood and triggering people to breathe.
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