Medical Definition of sphincter of Oddi. : a complex sphincter closing the duodenal orifice of the common bile duct.
Human blood is made of plasma (makes up 54.3% of the blood volume) and several kinds of cells (corpuscles); these are 1  â. erythrocytes (RBC) â 45% of blood by volume. 2  leukocytes (WBC) â 0.7% of blood by volume. 3  thrombocytes (platelets) â minute amounts.
Red blood cells, also known as erythrocytes, are the main formed component of blood, and they constitute 45% of the blood volume in an adult human. Unlike the other formed-elements, the red blood cells contain hemoglobin, a pigment that binds and transport oxygen.