Medical Definition of Red blood cells. Red blood cells: The blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide). Hemoglobin, aside from being a transport molecule, is a pigment. It gives the cells their red color (and their name).
Alexander Milne Calder (August 23, 1846 â June 4, 1923) was a Scottish American sculptor best known for the architectural sculpture of Philadelphia City Hall. Both his son, Alexander Stirling Calder, and grandson, Alexander Sandy Calder, became significant sculptors in the 20th century.
Important Terms, People, and Events. Alexander Hamilton was most likely born on January 11, 1757, although the exact year of his birth is unknown. Hamilton was born on the Caribbean island of Nevis or St. Kitts to Rachel Fawcett and James Hamilton, but he spent the majority of his youth on the island of St. Croix.