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Example of myogenic reactivity in a swine coronary arteriole. Muller et al. demonstrated how coronary arteriolar diameter (in μm; top) changed as transmural pressure (in mmHg; bottom) was varied (Muller et al., 1993; reproduced with permission). As distending pressure was increased from 40 to 80 mmHg in 10 mmHg increments, the steady-state diameter decreased. When transmural pressure was reduced from 80 mmHg, diameter increased.
