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When artery muscles contract, _____.
: the opening becomes smaller, and less blood flows through
: the opening becomes larger, and less blood flows through
: the opening becomes smaller, and more blood flows through
: the opening becomes larger, and more blood flows through

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morgaine816
the opening becomes smaller, and less blood flows through

When the artery contracts, it gets tighter and smaller.  Since there is less space, less blood flows through.

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