Abstract
1. 1. During prolonged diving, the green turtle ( Chelonia mydas agassizii) exhibits an extreme bradycardia that develops slowly and is broken every time the animal struggles. 2. 2. Pre-dive carotid arterial blood pressure is maintained for the first hour of a dive, implying peripheral vasoconstriction. 3. 3. Lactic acid does not appear in the carotid arterial blood for the first 30–60 min of a dive; if the dive persists, blood lactate slowly increases. 4. 4. On emergence there is a sharp increase in blood lactate concentration, further suggesting selective ischemia during apnea. 5. 5. The total blood lactate accumulation is slight, an indication of lowered metabolic rate during apnea. 6. 6. The green turtle survives 40 min–5 hr of submersion with no oxygen measurable in the tracheal air or carotid arterial blood, evidence of extreme resistance to asphyxial distress.
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