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    hey, when i was doing a question on the heart, diagrams of the cross-sectional area of the different blood vessels were shown:
    aorta----> arteries----> capillaries----> veins. the cross-sectional area increases from aorta ----> capillaries. can some one explain this to me ? i don't understand how the cross-sectional area increases even thought the vessels get narrower.

    also can you help with this question:
    describe the pressure changes in the blood as it flows through the circulatory system from the aorta to the veins.

    thanks
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    (Original post by Exotic-L)
    hey, when i was doing a question on the heart, diagrams of the cross-sectional area of the different blood vessels were shown:
    aorta----> arteries----> capillaries----> veins. the cross-sectional area increases from aorta ----> capillaries. can some one explain this to me ? i don't understand how the cross-sectional area increases even thought the vessels get narrower.

    also can you help with this question:
    describe the pressure changes in the blood as it flows through the circulatory system from the aorta to the veins.

    thanks
    This is because it is referring to ALL the capillaries in the body/capillary bed, even though each individual capillary is narrow, if you put them all together then their total cross sectional area is larger than arteries.

    And pressure drops from very high in the arteries to very low in the veins, that's essentially it for a describe question
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    (Original post by AortaStudyMore)
    This is because it is referring to ALL the capillaries in the body/capillary bed, even though each individual capillary is narrow, if you put them all together then their total cross sectional area is larger than arteries.

    And pressure drops from very high in the arteries to very low in the veins, that's essentially it for a describe question
    Ahh, I see now, thank you!!
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    Can you also explain why frictional resistance of blood flowing along the blood vessel decrease pressure. What does this mean? AortaStudyMore

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