fonalitÃ© | Flickr. American Express uses the first two numbers of the card to identify itself. That two-digit number will be either 34 or 37. The third and fourth digit signify the type of card and the currency being used, according to Clearpoint Credit Counseling.
Formed Elements of the Blood. the solid fraction of the blood, consisting of erythrocytes, leukocytes, and thrombocytes. The formed elements constitute up to 40 percent of the volume of the blood in lower vertebrates (fishes, amphibians, and reptiles) and up to 54 percent in higher vertebrates (birds and mammals, including man). The most numerous among the formed elements of the blood are the erythrocytes, which contain hemoglobin. They transfer oxygen from the respiratory organs to the tissues and help transfer carbon dioxide in the opposite direction.
Of course, we donât have little vehicles speeding through our veins, so how does blood do this? Whole blood is made up of red blood cells, white blood cells and platelets, all which are suspended in a fluid called plasma. Each of these components of our blood has a very specific and important job.Red blood cells contain hemoglobin, a type of protein that gives blood its red color, and are primarily responsible for carrying fresh oxygen throughout the body while removing spent carbon dioxide from the cells.f course, we donât have little vehicles speeding through our veins, so how does blood do this? Whole blood is made up of red blood cells, white blood cells and platelets, all which are suspended in a fluid called plasma. Each of these components of our blood has a very specific and important job.