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.
The Blood Cell The Blood Cell The Blood Cell is a BBC Books original novel written by James Goss and based on the long-running British science fiction television series "Doctor Who". It features the Twelfth Doctor and Clara Oswald. The book was released on 11 September 2014 along with "Silhouette" and "The Crawling Terror". "The Blood Cell" gained generally positive reviews, calling it an "effective chiller". Most of them commented the unusual way of narration from the first-person perspective of the administrator of the prison in which the book is set known as the Governor. More grim and darker tone is also noted.