Dear Expert-How come de-oxygenated blood from the right ventricle and auricle flows into the pulmonary ARTERY and oxygenated blood nbsp-flows nbsp-from the pulmonary VEIN into the left auricle and ventricle- Doesn-t that deny the fact that oxygenated blood flows in the arteries and de-oygenated blood in the veins- nbsp-

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Byju's Answer

Standard VIII

Biology

Oxygenation of Blood

Dear Expert,H...

Question

Dear Expert,
How come de-oxygenated blood from the right ventricle and auricle flows into the pulmonary ARTERY and oxygenated blood flows from the pulmonary VEIN into the left auricle and ventricle. Doesn't that deny the fact that oxygenated blood flows in the arteries and de-oygenated blood in the veins?

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Solution

Pulmonary artery and pulmonary vain are the two exceptions in human circulatory system in which pulmonary artery carries deoxygenated blood and pulmonary vein carries oxygenated blood. Other than these two all arteries carry oxygenated blood and all veins carry deoxygenated blood.

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Q. Read the statements and select the option which best describes the process that occurs during systematic circulation.
(i) The left atrium receives the oxygenated blood through the pulmonary veins. The left ventricle pumps the blood through the aorta to various parts and the de-oxygenated blood reaches right atrium.
(ii) The left atrium receives the oxygenated blood through pulmonary veins and pumps the blood through the aorta to various parts and the de-oxygenated blood reaches the right atrium.
(iii) The left atrium receives de-oxygenated blood and pumps into left ventricles which in turn pumps into pulmonary artery for oxygenation.
(iv) The right atrium receives the de-oxygenated blood and pumps into pulmonary artery for oxygenation.

Match the parts of the heart in Column I with the direction of flow of blood in Column II
$\begin{matrix} C o l u m n I & C o l u m n I I (i) R i g h t V e n t r i c l e & (a) P u m p s d e o x y g e n a t e d b l o o d i n t o t h e p u l m o n a r y a r t e r y (i i) P u l m o n a r y V e i n s & (b) T a k e s d e o x y g e n a t e d b l o o d (i i i) L e f t A t r i u m & (c) R e c e i v e s b l o o d f r o m d i f f e r e n t p a r t s o f t h e b o d y . (i v) P u l m o n a r y A r t e r i e s & (d) B r i n g o x y g e n a t e d b l o o d f r o m l u n g s t o t h e h e a r t . (v) L e f t V e n t r i c l e & (e) P u m p s b l o o d i n t o t h e a o r t a . (v i) R i g h t A u r i c l e & (f) R e c e i v e s d e o x y g e n a t e d b l o o d f r o m t h e p u l m o n a r y v e i n s . \end{matrix}$

Q. Assertion: Pulmonary artery carries oxygenated blood from the left ventricle to the lungs.
Reason: All arteries carry oxygenated blood.

Q. Arteries carries oxygenated blood but pulmonary artery carries deoxygenated blood and veins carry deoxygenated blood but pulmonary vein carries oxygenated blood is it true

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

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