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In arteries

Option: 1
Blood flow is towards the heart

Option: 2
Lumen diameter is wider veins

Option: 3
Valves are absent

Option: 4
Tunica externa is the thickest

Answers (1)

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COMPARISION OF ARTERIES AND VEINS

CHARACTERISTIC	ARTERY	VEIN
Lumen diameter	Narrowe than vein lumen	Wider than artery lumen; often appears as collapsedwhen cut into cross section
General wall thickness	Thicker than companion vein	Thinner than companion artery
Cross - sectional shape	Retains its circular cross section shape	Cross section tends to flatten out (collpase) of no blood is in the vein
Thickness tunic	Tunica media	Tunica externa
Elastic and collagen fibers in Tunics	More than in a vein	Less than in artery
Valves	None	Present in most vein
Blood pressure	Higher than in veins( larger arteries typically > 90mm Hg)	Lower than in arteries (approximately 2 mm Hg)
Blood flow	Transports blood away from heart	Transports blood to heart
Blood oxygen levels	Systematic arteries carry blood high in $O_{2}$ Pulmonary arteries carry blood low in $O_{2}$	Systematic vein carry blood low in $O_{2}$ Pulmonary veins carry blood high in $O_{2}$

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