State any four differences between arteries and veins with respect to the following criteria:
i. direction in which they carry blood
ii. pressure of blood flowing through them
iii. thickness of wall of these vessels
iv. presence of valves
v. position in the body
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veins: 1. they bring blood from body parts. 2. they carry deoxygenated blood except pulmonary veins. 3. veins have thin walls. 4. veins have wider lumen and are less elastic. 5. valves are present. 6. blood pressure is low
arteries: 1.they carry blood from the heart to body parts. 2. they carry oxygenated bloodexcept pulmonary artery. 3. arteries have thick walls. 4. arteris have narrow lumen and are elastic. 5. valves are absent. 6.
and the 6th point is: they end with capillaries
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veins: 1. they bring blood from body parts to heart
2.blood pressure is low and blood flow is slow and regular
3.veins have thin walls
4.valves are present
5.they start with capillaries
arteries: 1.they carry blood from the heart to body parts
2.blood pressure is high and blood flow is rapid and irregular
3. arteries have thick walls
4. valves are absent
5. they end with capillaries
2.blood pressure is low and blood flow is slow and regular
3.veins have thin walls
4.valves are present
5.they start with capillaries
arteries: 1.they carry blood from the heart to body parts
2.blood pressure is high and blood flow is rapid and irregular
3. arteries have thick walls
4. valves are absent
5. they end with capillaries
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