Coronary flow
- high metab demand
- high oxgen extraction
- metabolic hyperaemia mediated by adenosine, K+, hypoxia
effect of sympathetic stimulation
- alpha adrenergic effect = vasoconstriction
- however hyperaemia probably overrides this
- adrenaline → vasodilation (beta adrenergic action)
effect of parasympathetic stimulation
- parasympathetic stimulation → vasodilation