DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Heart is an organ which beats continuously to act as a pump for transport of blood, which carries other substances. The heart is located in the chest cavity with its lower tip slightly tilted towards the left. Your heart is roughly the size of your fist. To avoid the mixing of blood rich in oxygen and the blood in carbon dioxide, the heart has <br><b>(a)</b> two atria<br><b>(b)</b> two ventricles<br><b>(c)</b> four chambers<br><b>(d)</b> none of these