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.
Definition of 'indicator'. indicator (ÉªndÉªkeÉªtÉÊ³ ) An indicator is a measurement or value which gives you an idea of what something is like. ...vital economic indicators, such as inflation, growth and the trade gap. The number of wells is a fair indicator of the demand for water. Synonyms: sign, mark, measure, guide More Synonyms of indicator. 2. countable noun. A car's indicators are the flashing lights that tell you when it is going to turn left or right.