Abstract:The ability to perform at high levels of aerobic activity (i.e. athletic ability) increases with temperature among vertebrates. These differences in species’ activity levels, from highly active to sedentary, are reflected in their ecology and behavior. Yet, the changes in the cardiovascular system that allow for greater oxygen supply rates at higher temperatures, and thus greater activity levels, remain unclear. Here we show that vertebrates provide more oxygen to tissues at higher temperatures in part by incr… Show more
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