Ventilation Flashcards by Robbie Gruhl | Brainscape

Q

4 types of hypoxia

A

stagnant hypoxia: not moving blood

hypemic hypoxia: lowered Hb capacity

hypoxic hypoxia: low O₂

histotoxic hypoxia: inability to get O₂ off Hb

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Q

Amount normally breathed in and out

A

tidal volume

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Q

Normal tidal volume

A

500 mL

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Q

Amount exhaled after maximal inspiration

A

vital capacity

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Q

Normal vital capacity

A

6 L

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Q

Amount remaining after maximal exhilation

A

residual volume

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Q

Normal residual volume

A

1.5 L

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Q

Amount remaining in lungs after normal expiration

A

functional residual volume

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Q

Normal functional residual volume

A

2.5 L

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Q

Tidal volume caveat

A

500 mL

only 350 gets to alveoli

the rest in anatomic dead space

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Q

How to measure anatomic dead space

A

breath in pure O₂

measure N₂ as it comes off

plot against total expired volume

volume to midpoint of jump is anatomic dead space

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Q

Best perfused portion of the lung

A

lower portions

blood pools at the bottom due to gravity

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Q

How to measure functional residual capacity

A

He dilution test

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Q

How to measure physiologic dead space

A

CO₂ dilution in exhaled air

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