Bone Microvasculature Tracks Red Blood Cell Size Diminution in Triassic Mammal and Dinosaur Forerunners

Vertebrate red blood cells (RBCs) display a range of sizes, spanning orders of magnitude in volume in different clades [1Gulliver G. Observations on the sizes and shapes of the red corpuscles of the blood of vertebrates, with drawings of them to a uniform scale, and extended and revised tables of measurements.Proc. Zool. Soc. Lond. 1875; 1875: 474-495Google Scholar]. The importance of this size variation to diffusion during exercise is...