What part of the heart does the right vagus nerve primarily innervate?

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Through which of the following vessels does oxygenated blood return to the heart from the lungs?

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What vessels below serve as a blood supply to the heart muscle itself?

______________ always carry blood away from the heart.

In the fetus, the umbilical _____________ in the umbilical cord carries oxygen from the placenta to the fetus.

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The human body has only one ____, but has two of each of the rest of the following vessels.