The predominant cells in blood are the red blood cells (RBC) which contains a protein called hemoglobin. Hemoglobin is the principal determinant of the color of blood. Arterial blood and capillary blood are bright red, as oxygen imparts a strong red color to the heme group.
RNA is assembled as a chain of nucleotides, that is usually  single-stranded. In eukaryotic cells, it can be found in the  nucleus and cytoplasm. Edit. Share to: Lsilvstew. 2,538 Contributions. Answered Most Recently. In Genetics.
Extracellular RNA. Extracellular RNA (also known as exRNA or exosomal RNA) describes RNA species present outside of the cells from which they were transcribed. In Homo sapiens, exRNAs have been discovered in bodily fluids such as venous blood, saliva, breast milk, urine, semen, menstrual blood, and vaginal fluid.