I’m reviewing cardiovascular and respiratory physiology for the Boards right now, and a little self-experimentation goes a long way. I have a little burst capillary in my cornea right now, and I’m pretty sure it’s from doing a Valsalva maneuver to refresh my blood pressure and heart rate physiology. And whenever I start reading about tidal volumes and functional residual capacities and dead space , I have this uncontrolled need to breathe really deeply.

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