The central dogma of molecular biology is centered upon the process of in which the information from dna is transcribed and translated, resulting in amino acids being joined into polypeptides.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.