why is it difficult for blood to go up to the heart?
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Answer:
VEINS ARE RESPONSIBLE FOR CARRYING BLOOD UP TO HEART FROM LOWER BODY,FIRSTLY IT'S AN AGAINST GRAVITY MOVEMENT.SECONDLY,BLOOD PRESSURE IN VEINS IS FAR LESS THAN AS IT IS IN ARTERIES,MAKING IT DIFFICULT FOR THE BLOOD TO GO BACK TO HEART.TO COMPENSATE VEINS HAVE VALVES,HELPING THE FLOW OF BLOOD UP TO HEART AND PREVENTING BACK FLOW OF BLOOD
HOPE SO IT HELPS YOU WITH YOUR CONFUSION.
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