Travis is taking a long run, and his muscle tissue needs more oxygen. He is breathing heavily and taking in a lot of oxygen. How does this exercise affect circulation?

During a long run, working muscles need more oxygen, so circulation speeds up. Travis’s heart pumps faster, moving oxygen-rich blood from the lungs to his muscles more quickly. The heart does not pump more slowly, and exercise does not normally block coronary arteries or immediately create new blood vessels.

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