active voice: the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb
voice: (linguistics) the grammatical relation (active or passive) of the grammatical subject of a verb to the action that the verb denotes
atrioventricular node: a node of specialized heart muscle located in the septal wall of the right atrium; receives impulses from the sinoatrial node and transmits them to atrioventricular bundle