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Biology, 22.10.2019 14:00 moldybubblegum11

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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When artery muscles contract,
: the opening becomes smaller, and less blood flows through
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