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. 2010 Jan 21;108(4):811–820. doi: 10.1152/japplphysiol.00600.2009

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Fig. 1. — Tracings of arterial blood pressure (BP) in rats during a trial of voluntary diving underwater (case 1967; A), swimming on the water's surface (case 1967; B), forced submersion (“dunking”) of a rat naive to water (case 2045; C), forced submersion of a rat trained to dive underwater (case 2079; D), nasal stimulation with ammonia vapors in a rat anesthetized with urethane (case 1968; E), and nasal stimulation with ammonia vapors in a decerebrate rat (case R2372; F). Down arrow indicates the start of swimming, underwater submersion, or stimulation of the nasal mucosa with ammonia vapors, while up arrow indicates the end of stimulation. All traces are at the same time scale.