Question

a dead space volume of 150 mL &breathes at a frequency (f) of 10 breaths/min using a tidal f Tory ha volume (V) of 650 mL. What is Tory's minute ventilation (V)? what is her alveolar ventilation (VA)? c. Tory decides to breathe through a straw (for fun) whose volume is 150 mL (yes, it is a good- sized straw). She is not breathing through her nose at all. If both f and V, remain constant, what will Tory's new V, be? What new respiratory rate would Tory have to adopt if she wished to maintain V at 5.0 L/mi while she was breathing through the straw? (Assume tidal volume is still 650 mL) e. What new tidal volume would Tory have to adopt if she wished to maintain VA at 5.0 L/min while she was breathing through the straw? (Assume f is still 10 breaths/min)
Calculating minute,alveolar ventilation.

Answer 1

Respiratory Minute Volume in Health and Disease. Minute ventilation (or pulmonary ventilation, or respiratory minute volume, or flow of air) is the volume of air that can be inhaled (inhaled minute volume) or exhaled during one minute.

If both tidal volume (V_T) and respiratory rate (ƒ or RR) are known, minute volume can be calculated by multiplying the two values.

Given values are

tidal volume = 650 ml

Dead space volume = 150 ml

Respiratory rate = 10 breath/ min

So, after putting values minute ventilation will be:

650 X 10 = 6500 ml of air per minute

Alveolar ventilation refers to the amount of gas that reaches the alveoli during a breath.

It is calculated as ([tidal volume − dead space] × respiratory rate)

So, after putting values Alveolar ventilation will be:

(650-150) X 10 = 5000 ml