Question

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

Answer 1

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.