Fig. 1.From: Lepidoptera demonstrate the relevance of Murray’s Law to circulatory systems with tidal flowA cross-section of a wing vein of Attacus atlas, modified from [18]. In a, the trachea does not occupy the entirety of the hemocoel, allowing hemolymph to flow. In b, the trachea occupies nearly the entirety of the hemocoelBack to article page