The Circulatory and Respiratory Systems Answers…

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Cells need oxygen to make energy. Oxygen-rich blood is transported to tissues. When the oxygen is dropped off, it needs to move through structures that are small and thin.Which vessels allow for oxygen movement into the tissues?

arteries

veins

heart

capillaries

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Kristen is running a half marathon. By her tenth minute of running, her breathing rate has increased from her resting rate.Which statement best describes how her tissues are responding to her running?

They need more oxygen to function, so gas exchange needs to decrease.

They need more oxygen to function, so gas exchange needs to increase.

They need more carbon dioxide to function, so gas exchange needs to increase.

They need more carbon dioxide to function, so gas exchange needs to decrease.

At the site of gas exchange in the lungs, where does the oxygen move?

O2 moves from the alveoli to the white blood cells.

O2 moves from the white blood cells to the alveoli.

O2 moves from the alveoli to the red blood cells.

O2 moves from the red blood cells to the alveoli.

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