The figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of the label and functions of the part.

B-CAPILLARY - Thin without muscle layer and wall is two cell layer thick

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C-VEIN- Thin walled and blood flows in jerks/spurts

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D-PULMONARY VEIN- Takes oxygenated blood from heart,

p O_{2} = 100

mm of Hg

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A-ARTERY-Thick walled and blood flows evenly

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Solution

The correct option is C D-PULMONARY VEIN- Takes oxygenated blood from heart, $p O_{2} = 100$ mm of Hg
The pulmonary vein that carries oxygenated blood and has a partial pressure of oxygen being 100 mm of Hg. Capillary is without muscle layer and its wall is one cell in thickness. The blood in arteries flows in jerks or spurts. The wall of the arteries are thicker than that of veins with its lumen being smaller as compared to that of veins.
Thus the correct answer is option C.

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Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.

The blood vessel which carries oxygenated blood from the lungs to the heart is :
(a) main artery
(b) pulmonary artery
(c) main vein
(d) pulmonary vein

Blood in the arteries flow with _______ pressure than blood in the veins. Therefore,the walls of the arteries are ________ than veins.

Q. The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

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