Which statements about blood vessels are correct?
1 Collagen fibres in the walls of arteries and veins prevent overstretching.
2 Elastic fibres in large arteries allow stretching during ventricular systole.
3 Smooth muscle in arteries controls the distribution of blood to different parts of the body.
4 Veins have valves because their walls are thin.
1 )
1, 2, 3 and 4
1, 2 and 3 only
3 )
2 and 4 only
4 )
3 and 4 only
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