Doppler ultrasound flow meters had not come into being. Central nervous system CNS tends to be almost unpredictable other than it is a considerable risk at an oxygen pp of above 1. Consequently, hypoxia results instantly, and the diver blacks out. The respiratory system brings oxygen to the body and carries waste carbon dioxide out.
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Carotid-sinus receptors monitor blood pressure within the carotid arteries and send impulses to the cardioinhibitory centre in the brain to regulate the heart. In most severe cases unconsciousness and death. As the oval window flexes, it pushes against the perilymph, causing pressure waves to oscillate through the cochlea.