Question
Figure shows blood circulation in humans with labels $$A$$ to $$D.$$ Select the option which gives correct identification of label and functions of the part:
A.
$$A$$ - Artery - thick walled and blood flows evenly
B.
$$B$$ - Capillary - thin without muscle layers and wall two cell thick
C.
$$C$$ - Vein - thin walled and blood flows in jerks/spurts
D.
$$D$$ - Pulmonary vein - takes oxygenated blood to heart $$P{O_2} = 95\,mm\,Hg$$
Answer :
$$D$$ - Pulmonary vein - takes oxygenated blood to heart $$P{O_2} = 95\,mm\,Hg$$