Editing Blood (section)

===In non-mammals===
[[File:Newbloodm.jpg|thumbnail|Vertebrate red blood cell types, measurements in micrometers]]
[[Image:Frogrbc1000x.jpg|thumb|Frog red blood cells magnified 1000 times|left]]
[[Image:Turtlerbc1000x.jpg|thumb|right|Turtle red blood cells magnified 1000 times]]
[[Image:Chickenrbc1000x.jpg|thumb|right|Chicken red blood cells magnified 1000 times]]
[[Image:Humanrbc1000x.jpg|thumb|Human red blood cells magnified 1000 times]]

Human blood is typical of that of mammals, although the precise details concerning cell numbers, size, [[protein structure]], and so on, vary somewhat between species. In non-mammalian vertebrates, however, there are some key differences:<ref name="VB">{{cite book |last1=Romer |first1=Alfred Sherwood |url=https://archive.org/details/vertebratebody0000rome_a5a9/page/404/mode/2up |title=The Vertebrate Body |last2=Parsons |first2=Thomas S. |publisher=Holt-Saunders International |year=1977 |isbn=978-0-03-910284-5 |location=Philadelphia |pages=404–406 |url-access=registration |name-list-style=vanc}}</ref>
*Red blood cells of non-mammalian vertebrates are flattened and ovoid in form, and retain their cell nuclei.
*There is considerable variation in the types and proportions of white blood cells; for example, acidophils are generally more common than in humans.
*Platelets are unique to mammals; in other vertebrates, small nucleated, spindle cells called [[thrombocytes]] are responsible for blood clotting instead.