Please help! Dot point 2.3 (1 Viewer)

[jacksonhughes95]

I need help answering these questions please.
2.3.1 explain why arteries need thicker layers of elastic tissue and muscle fibres.
2.3.2 explain why it is incorrect to say that arteries carry oxygenated blood and veins carry oxygenated blood.

Would be greatly appreciated!

 

[Hazballs]

2.3.1
Arteries carry blood away from the heart at a high blood pressure and this placed on arteries from the heart pumping creates great stress. thats why the arteries have thick wall's and are elastic/muscular.. They have muscle fibres i them which can contract and relax with each heart beat allowing for the maintenance of a constant blood pressure and rate of blood flow to all tissues and that contracting and relaxing of the arterial walls is also what causes the pulse on your wrist or neck..

2.3.2
Not to sure, but doesn't the right ventricle pump deoxygenated blood via the pulmonary artery to the lungs for it to get oxygenated and then the pulmonary vein brings the oxygenated blood back..

 

[jacksonhughes95]

Thanks so much!

 

[epz]

Thanks so much!

Hey,
here is a quick video (10 minutes)

http://www.youtube.com/watch?v=UkSzcK9LTLw

OR

Good luck!