Human Anatomy, Physiology, and Medicine. Anything human!
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I'm not sure about the answer but as much as I know, as vena cava is a vein, blood pressure in an artery is higher. Because, heart pumps blood to the arteries; but blood is collected back with veins by different methods.
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Deffinetly vena cava has lower blood pressure. Actually in vena cava blood pressure is negative(that is what books say, in my opinion pressure canm not be negative. I have emailed a professor at Cambridge and he agreed with me but gave me an explanation that i could't understand ).Anyway, that is what your regular biology book will say
PS: I like the title, Artery vs Vein, it's funny
The capillary beds still have higher blood pressure than veins.
As blood leaves the aorta and flows through the systemic circulation, its pressure falls progressively as the distance from the left ventricle increases. Blood pressure decreases to about 35mmHg as blood passes from systemic arteries to systemic arterioles and into capilliaries. At the venous end of capilliaries, blood pressure has droped to about 16mmHg. Blood pressure continues to drop as blood enters systemic venules and then veins because these vessels are farthest from the left ventricle. Finally, blood pressure reaches 0mmHg as blood flows into the right ventricle.
I hope this helps. If you need more details, just ask.
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Out of curiosity, what did the professor say?
Well I don't have that email any more but i am pretty sure i printed it. I will look for it and see if i can find it. It was a really strange thing with composing diffrent forces... I don't like physiscs. I just asked out of curiosity. By the way, i was really surprised when he answered.
From what i still remember, a force of aspiration can be interpreted as negative pressure. But as we know from physics 101: pressure=force/sufrace. So, the value of a force can not be negative, therefore pressure can not be negative. But his explinantion was much more complicated... some of those words i can't even pronunce
vein has smaller pressure than the artery because the left ventricle must be able to pump the blood around the body parts therefore the pressure must be pretty big. the veins only rely on muscle pumps or arterial smooth muscles (some veins are located directly below arteries). plus veins are generally wider than arteries and used as blood reserve also veins have to fight gravity to pump deoxygenated blood back to the heart.
this is why when you cut arteries, blood sprays out and when you cut veins, blood tends to ooze out (from kungfu movies).
As far as I know is Aorta gets a higher pressure because it's directly pumped out from the left ventricle meanwhile vena cava gets a lower pressure because it's pumped not directly from the heart but from other move of the body, example like the move of our muscles, effects from arthery pumping, etc.
Arteries pressure 120mmHG
Capillaries between 15-40mmHG
It reached almost 0mmHG in the venue cavae, just before the venae cavae open into the right atrium of the heart.
Arteries for the immense pressure when blood is pump out of from the left ventricle. As it flows from the
blood pressure keeps dropping as it goes further away from the heart because it loses kinetic energy with distance increase. Furthermore blood flowing from the lower limbs back to heart through the inferior vena cava is aginst gravitational pull. thats why vena cava, veins all have semi lunar valve to prevent backflow of blood.
12 posts • Page 1 of 1
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