The large arteries close to the heart have a thick elastic layer in their walls.
Which statements about this layer are correct?
1 evens out the blood flow from the heart
2 reduces friction within these blood vessels
3 prevents too much pressure bursting the artery wall
1 )
1 and 2 only
1 and 3 only
3 )
2 and 3 only
4 )
3 only
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