Ba: Calcium atoms in bones absorb x-rays, allowing doctors to clearly see the body's skeleton. X-rays can also be used to see blood vessels and internal organs. Special liquids, such as compounds made with the element barium (Ba), are swallowed by the patient, or injected into the bloodstream. The liquids help absorb x-rays, making certain tissues show up more clearly.
N20: Certain chemicals can be used as an anesthetic. Nitrous oxide (N2O) is commonly used in surgery and dentist offices.
C 14H 10O 4: Many acne medications contain benzoyl peroxide (C14H10O4), a compound that releases oxygen during a chemical reaction with skin. The oxygen kills anaerobic bacteria, which cannot live in the presence of oxygen.
The cell is the basic structural, functional and biological unit of all known living organisms. Cells are the smallest unit of life that is classified as a living thing, and are often called the "building blocks of life.
