Red blood cell are cells present in blood in order to transport oxygen. The only known vertebrates without red blood cells are the crocodile icefish (family Channichthyidae); they live in very oxygen-rich cold water and transport oxygen freely dissolved in their blood. While they no longer use hemoglobin, remnants of hemoglobin genes can be found in their genome. Vertebrate red blood cells consist mainly of hemoglobin, a complex metalloprotein containing heme groups whose iron atoms temporarily bind to oxygen molecules (O) in the lungs or gills and release them throughout the body. Oxygen can easily diffuse through the red blood cell's cell membrane.
Blood Red Horse Blood Red Horse Blood Red Horse is a 2004 young adult historical novel by author K M Grant. The book was published in 2004 by Puffin Books and in the US in 2005 by Walker Children's. "Blood Red Horse" is the first novel in the De Granville Trilogy and was followed by the books "Green Jasper" and "Blaze of Silver". In 2006 the audiobook version of "Blood Red Horse" won an AudioFile Earphones Award and in 2007 was one of YALSA's recommended audiobooks for 2007. "Blood Red Horse" follows Will and Ellie, two young teens growing up during the time