What chamber of the heart does blood leave as it goes to the lungs? O left atrium right ventricle O left ventricle O right atrium QUESTION 34 The vena cava is the largest O atrium O valve O artery O vein QUESTION 35 Which of the following describes the heart beat? O First the atria contract, then the ventricles contract, then all chambers relax. All chambers contract at the same time, then they all relax. O First the atria contract, then they relax, then the ventricles contract. O First the ventricles contract, then the atria contract, then all chambers relax.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.