(i) Thick-walled blood vessel
(ii) Blood flows from the heart to different parts of the body
(iii) Blood flows with high pressure with a high speed
(iv) Valves are absent
• Thin walled blood vessel.
• Brings blood from the different parts of the body to the heart.
• Blood flows with low pressure and with a low speed.
• Contains valves which permit blood flow only towards the heart.
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