Many scientists believe that stem cells might be useful for treating certain human diseases in the future. stem cells are cells that a. are very small and can only be found in plants. b. have the potential to differentiate into various specialized cell types. c. lack the ability to undergo cell division through mitosis. d. are modified viruses that can be used to transfer genetic information.

The answer to this is B.

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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.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;