If oxygenated blood flows in the artery and deoxygenated blood flows in veins then why does blood comes in the left atrium through pulmonary veins and goes out from the right ventricle through the pulmonary artery in the heart?

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Solution

Blood flow:
The blood which flows away from the heart is known as the artery, and the one which brings blood toward the heart is called the veins.
We mostly see that the arteries carry oxygenated blood from the heart to other parts of the body and deoxygenated blood from different parts of the heart.
Now there is an exception in the case of the heart, we see that the right ventricle receives the deoxygenated blood from the right atrium which is then pumped to the pulmonary artery that takes away the blood from the heart to the lungs for oxygenation.
After oxygenation of blood from the lungs it comes back to the heart through the pulmonary vein(vein carries blood toward the heart).
Now, this oxygenated blood is pumped to different parts of the body.

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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. Which of the following statement(s) wrong with regard to heart?
A. Left atrium receives deoxygenated blood from different parts of the body while right atrium receives deoxygenated blood from the lungs.
B. Right atrium receives deoxygenated blood from different body parts while right ventricle pumps deoxygenated blood to the lungs.
C. Left atrium receives oxygenated blood from lungs while left ventricle pumps oxygenated blood to different parts of the body.
D. Pulmonary vein carries deoxygenated blood to the lungs and pulmonary artery brings oxygenated blood towards the heart.

Q. In the pulmonary artery blood flows from the heart to the lungs and in the pulmonary vein blood returns from the lungs to the heart. The blood in the pulmonary artery is

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

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