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Sudden application of cold water to the A. Hand causes local vasoconstriction. B. Hand causes vasodilation in the opposite hand. C. Oesophagus can cause changes in the electrocardiogram. D. External auditory meatus causes nausea and nystagmus. E. Whole body by immersion causes apnoea. |
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Answer» A. True Due to the direct effect of cold on vascular smooth muscle. B. False Immersion of a hand in cold water provokes general vasoconstriction and a rise in blood pressure – the cold pressor response. C. True By cooling the myocardium. D. True By inducing currents in endolymph which stimulate vestibular receptors. E. False By stimulating uncontrollable gasping under water, it may result in drowning. |
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