The first six digits of a card number (including the initial MII digit) are known as the issuer identification number (IIN). These identify the card issuing institution that issued the card to the card holder. The rest of the number is allocated by the card issuer. The card number's length is its number of digits. Many card issuers print the entire IIN and account number on their card.
Blood. 1  Blood is a connective tissue. 2  Blood is made of a liquid matrix called plasma and 3 types of formed elements (cells or cell fragments). 3  There are no visible fibers in plasma, but there are proteins that can be converted to fibers under certain conditions (e.g. blood vessel damage).
View full size image. Enough to fill one or two one-gallon milk jugs. Blood accounts for about seven percent of human body weight, and its density is only slightly more than that of pure water. Blood is made up of plasma (which accounts for about 3 liters), red blood cells, white bloods cells, and platelets. Vitamins, electrolytes and other nutrients are dissolved in the blood and carried to the body's cells and organs. Follow Life's Little Mysteries on Twitter @llmysteries.