Answer:
Explanation:
From the capillaries, blood passes into venules, then into veins to return to the heart. Arteries and arterioles have relatively thick muscular walls because blood pressure in them is high and because they must adjust their diameter to maintain blood pressure and to control blood flow.
No just be careful because somethings might not be the best
Count sheep, count down or count up... or just clear your mind whilst looking at a single spot on your ceiling.
Respiratory system I think. I MAY BE WRONG.
Hope I helped!
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