Red blood cell Much of this potential appears to be contributed by the exposed sialic acid residues in the membrane: their removal results in zeta potential of −6.06 mV. When red blood cells undergo shear stress in constricted vessels, they release ATP, which causes the vessel walls to relax and dilate so as to promote normal blood flow. When their hemoglobin molecules are deoxygenated, red blood cells release S-nitrosothiols, which also act to dilate blood vessels, thus directing more blood to areas of the body depleted of oxygen. Red blood cells can also synthesize nitric oxide enzymatically, using L-arginine as substrate, as do
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