How many types of rna are there and what do they do?

there are 4 types of rna, each encoded by its own type of gene: mrna - messenger rna: encodes amino acid sequence of a polypeptide. trna - transfer rna: brings amino acids to ribosomes during translation. rrna - ribosomal rna: with ribosomal proteins, makes up the ribosomes, the organelles that translate the mrna.

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

a and c are the answeres