First blood enters into the top right chamber, the right atrium, stop there for a moment then drops down into the bottom right chamber, the right ventricle. When your heart beats the used blood in the bottom right chambers shoots out of the heart and through an artery into you lungs.
indicator - (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction.
  Ok, to detect macromolecules in foods you use chemical indicators. An indicator is a â¦ substance that changes to indicate the presence of a particular compound or type of compound.The indicator may change color or temperature, or produce some other substance, such as, bubbles or a distinctive odor.   A macromolecule is a molecule made up of two or more smaller molecules.   A very large molecule such as a polymer or protein, consisting of many smaller struct â¦ ural units linked together.