Definition of ERYTHROPOIESIS. : the production of red blood cells (as from the bone marrow). â erythÂ·roÂ·poiÂ·etÂ·ic \-Ëe-tik\ adjective.
Today, on a Moment of Science, how humans are like rats. One argument against scientific experiments involving animals is that physiological differences between humans and other species is so great that an animalâs response to a certain procedure or medication actually tells us nothing about the likely human response.eâre both warm blooded, and rats eat everything we doâ¦ and live where we live. More importantly, rats and humans often suffer from the same diseases. Thatâs because humans and rats have the same basic physiology, similar organs, and similar body plans.
Size. The average body length of adult rats is 9 to 11 inches, plus a tail of 7 to 9 inches, according to the American Fancy Rat and Mouse Association. Your pet rat could grow to be up to 20 inches long from nose tip to tail tip.In rare instances, an adult male pet rat might grow to weigh 2 lbs.The rat's body can compress to allow it to access small spaces -- an opening the size of a quarter in your wall or near a pipe will allow a rat to enter your home.our pet rat could grow to be up to 20 inches long from nose tip to tail tip. In rare instances, an adult male pet rat might grow to weigh 2 lbs. The rat's body can compress to allow it to access small spaces -- an opening the size of a quarter in your wall or near a pipe will allow a rat to enter your home.