Question

Differentiate between arteriole and venule on the basis of their structure.

Answer 1

Answer:

Arteries transport blood away from the heart and branch into smaller vessels, forming arterioles. Arterioles distribute blood to capillary beds, the sites of exchange with the body tissues. Capillaries lead back to small vessels known as venules that flow into the larger veins and eventually back to the heart.

Explanation:

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Answer 2

Arteries and arterioles have thicker walls compared to veins and venules.

Explanation:

• Because they are closer to the heart and receive blood that is pumped out at with greater pressure.
• The lumina of venules are much larger and have thinner walls than corresponding arterioles.  
• The walls of the veins are much thinner than arterioles compared to the diameter of their lumen.
• Veins and venules can withstand a much lower pressure from the blood flowing through them. Their lumens are correspondingly larger in diameter to allow more blood to flow with less vessel resistance.  

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