Assertion: beta blocker | /r/CapableOf | block the receptor sites
Facets:
value: for norepinephrine
type: TRANSITIVE-OBJECT
Source sentences:
text: Beta blockers are competitive antagonists that block the receptor sites for the endogenous catecholamines epinephrine (adrenaline) and norepinephrine (noradrenaline) on adrenergic beta receptors, of the sympathetic nervous system, which mediates the fight-or-flight response.