NEETBiologyBody Fluids and Its CirculationMCQ+4 / −1
The 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.


- AA - Artery-Thick walled and blood flows evenly
- BC - Vein-Thin walled and blood flows in jerks/spurts
- CD - Pulmonary vein-Takes oxygenated blood to heart, pO2 = 95 mmHg
- DB - Capillary-Thin without muscle layer and wall two cell layers thick
View written solutionFree
Correct answer: C
A- Artery : Carries blood from heart to
different body parts. It is thick-walled and elastic. The
flow of blood in it is intermittent.
B - Capillary : Nutrients, hormones, gases etc. can
diffuse into tissue cells through capillaries and vice
versa. It is thin-walled, and only one layer thick resting
on basement membrane.
C - Vein : Brings blood from different body parts to
the heart. It is thin-walled and acts as low-resistance
conduct for blood flow.
D - Pulmonary vein : Two pulmonary veins from each
lung transport the oxygenated blood to the left atrium.
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