Heart and along the conduction system of the heart. The heart receives blood low in oxygen from the systemic circulation, which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here it is pumped into the pulmonary circulation, through the lungs where it receives oxygen and gives off carbon dioxide. Oxygenated blood then returns to the left atrium, passes through the left ventricle and is pumped out through the aorta to the systemic circulation−where the oxygen is used and metabolized to carbon dioxide. The heart beats at a resting rate close to
Sandra (given name) Sandra (given name) Sandra is a female name, which is often used as a short form for Alexandra or Cassandra. Alexandra is a feminine form of the male name Alexander, which is a romanization of the Greek name Ἀλέξανδρος "Alexandros". It is generally interpreted to mean "protector of man" or "defender of man". The name Cassandra is also from the Greek (: "she who entangles men"). Cassandra is known in Greek mythology, as the daughter of King Priam and Queen Hecuba of Troy. She was loved by Apollo and given the gift of prophecy but when she did not fall