Which risk increases when ventilation rate lowers across avian lung parabronchi?

💡 Explanation

When ventilation slows, reduced oxygen concentration gradients reduce the driving force behind countercurrent exchange, limiting oxygen diffusion from air capillaries to blood capillaries because efficient gas uptake depends on maintaining concentration differences. Therefore exchange efficiency decreases, rather than metabolic rate, growth, or sensory thresholds which depend on other specific biological factors.

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