Final answer:
None of the options directly relate to the cardiovascular arteriodilatory effects of autacoids. H1, H2, H3, and H4 receptors are predominantly connected with allergy, acid secretion, neurotransmission, and immune response.
Step-by-step explanation:
The question asked was about the direct cardiovascular arteriodilatory effect of autacoids and which receptor primarily mediates it. Autacoids are locally acting signaling molecules that regulate blood pressure and blood flow through vasoconstriction and dilation. They influence the cardiovascular system through several receptors.
However, none of the options presented directly correlate with autacoid function. Just for reference: H1 receptor is related to allergic reactions, H2 receptor is involved in controlling gastric acid secretion, H3 receptor is mostly found in the central nervous system affecting neurotransmitter release, and H4 receptor is linked to immune responses. Although some autacoids can indirectly influence these receptors, they are not directly involved in cardiovascular arteriodilation.
Hence, the question doesn't provide a correct option.
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