Sickle-cell disease is a genetic disorder that causes many red blood cells to become sickle shaped. As shown in the diagram, sickle-shaped cells can clog blood vessels and impede blood flow. What does the effect of sickle-shaped cells on blood flow imply about the shape of normal red blood cells?

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The shape of normal red blood cells must allow them to easily slide through blood vessels. Red blood cells are shaped similar to to inner tubes so they can slide through the "waterslides" of blood vessels.

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