Arteries and Veins

Arteries and Veins

Both arteries and veins are tubes made of four layers--a protective fibrous covering, a middle layer of smooth muscle and elastic fibers and an inner layer of connective tissue lined with a smooth layer of cells. Arteries have a thicker muscle layer to withstand the greater blood pressure. Veins are wider and adapt to the changing volume of blood. Blood flows slowly through veins because it has little pressure behind it. Blood flow in the veins relies on the rhythmic contraction of surrounding muscles and the pumping action of nearby arteries to return it to the heart. One way semilunar valves, which occur at intervals inside the veins, prevent any possible backflow of blood.

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• Arteries
• and
• Veins

[victorman15]

he couldn't sound more like a computer

[DrSpock74]

were you expecting something related to yeasayer also?

[xBoredLilKez]

thanks this helped for my Science home work :)

[Rosemarissa]

um, this doesnt even name the layers of the vessels..??? Tunica media, externa etc.

[AusParis2011]

Can somebody please help me out? i need to use this information for one of my assignments and for refernce i need to know where he got this information, whether its a book, journal ANYTHING please :)

[kmp1066]

arteries carry blood away from the heart

[tupsdaman]

''return to the heart''

[Skinnnails]

Arteries carry blood away from the heart.

[360gamer4life12]

My friend thought that the arteries also carried blood...i was right -.-, or wAS i?

[jamster]

excellent video

[gamekid1016]

lol ye

[AussieYobbo]

yes lol