Question

Identify the correct label with its functions from a - d.

• A. c - vein, thin-walled, blood flows in jerks spurts
• B. d - pulmonary vein, takes oxygenated blood to heart, $p{O}_2$ = 95 mm Hg
• C. a - artery, thick-walled, blood flows evenly
• D. b - capillary, thin-walled, without muscle layers and wall two cell thick.

Answer 1

The correct option is B d - pulmonary vein, takes oxygenated blood to heart, $p{O}_2$ = 95 mm Hg

In the given diagram:

• a represents aorta which has a narrow lumen and thick arterial walls. Aorta carries oxygenated blood from the left ventricle to body parts.
• b represents capillaries which are small branching blood vessels transporting blood to body tissues.
• c represents vena cava which has a wider lumen and thin muscular wall. Vena cava caries deoxygenated blood from body parts to the right atrium.
• d represents pulmonary vein which carries oxygenated blood from the lungs to left auricle of heart. Partial pressure of oxygen pO₂ in pulmonary vein is 95 mm Hg.

Hence, d shows correct functions.

So, the correct answer is 'd - pulmonary vein, takes oxygenated blood to heart, pO₂ = 95 mm Hg'.