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(1) It is double circulation because blood passes through the heart 2 times for 1 complete circulation.
(2)◆ Arteries -
Structural - Narrow lumen.
- Valves absent.
Functional - Carry blood away from the heart to other organs.
- Carry oxygenated blood(except pulmonary).
◆ Veins -
Structural -Wide lumen.
-Valves present.
Functional -Carry blood from organs towards the heart.
-Carry deoxygenated blood(except pulmonary)
(2)◆ Arteries -
Structural - Narrow lumen.
- Valves absent.
Functional - Carry blood away from the heart to other organs.
- Carry oxygenated blood(except pulmonary).
◆ Veins -
Structural -Wide lumen.
-Valves present.
Functional -Carry blood from organs towards the heart.
-Carry deoxygenated blood(except pulmonary)
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