Why are males more likely to have a heart attack compared to females?
Are you asking the question for all species or just humans?
There are many studies which try to address which sex is more prone to coronary failure, but the consensus of opinion as to wich sex, if either, is more prone to heart attack is becoming more blurred. Historically men are at greater risk, but that gap has been narrowing (See this reference http://www.ncbi.nlm.nih.gov/pubmed/19858433).
Also, see this recent paper in which the authors report that gender is not a factor in risk of having a heart attack http://www.ahjonline.org/article/S0002-8703(10)00901-4/abstract
There are many other factors other than gender to consider when trying to answer such a question. For example age, ethnicicty, previous health conditions, hereditary risk factors and environmental factors.
You may wish to consider asking your question again with some more specifics in order to get the answers that you really want.
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