Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the correct label and give its function/s.

A- Pulmonary vein- takes impure blood from body parts,

P O_{2} = 60 m m H g

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B- Pulmonary artery- takes blood from heart to lungs,

P O_{2} = 90 m m H g

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C- Vena Cava- takes blood from body parts to right auricle,

P C O_{2} = 45 m m H g

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D- Dorsal aorta- takes blood from body parts to right auricle,

P O_{2} = 95 m m H g

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Solution

The correct option is A C- Vena Cava- takes blood from body parts to right auricle, $P C O_{2} = 45 m m H g$
Human blood circulation is responsible for the transport of nutrients and oxygen to the different parts of the body. Oxygen-rich blood travels through the pulmonary vein and the left atrium into the left ventricle. So, the partial pressure of oxygen will be very high. The pulmonary artery carries the deoxygenated blood from the right ventricle of the heart to the lungs. Since, the blood is deoxygenated, the blood will have more partial pressure of carbon dioxide than oxygen. Aorta carries the oxygen rich blood from the left side of the heart to the body. The vena cava is responsible for carrying the doxygenated blood from the lower and middle parts of the body to the right atrium. The partial pressure of carbon dioxide in vena cava or veins is equal to 45 mm Hg. The partial pressure of oxygen in arterial blood is equal to 100 mm Hg.
So, the correct answer is option C.

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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. Draw the diagram of human heart and label the following parts which
(i) receives deoxygenated blood from vena cava,
(ii) send deoxygenated blood to lung through pulmonary artery,
(iii) receives oxygenated blood from lungs and
(iv) sends oxygenated blood to all parts of the body through aorta.

Q. Blood from the lungs enters the heart through the
(a) pulmonary artery
(b) pulmonary vein
(c) aorta
(d) vena cava

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. Match the blood vessels of Column (A) with their functions in Column (B) with respect to the human heart.

\begin{matrix} C o l u m n (A) & C o l u m n (B) a . V e n a c a v a & (i) T a k e s a w a y o x y g e n a t e d b l o o d b . P u l m o n a r y v e i n & (i i) B r i n g s d e o x y g e n a t e d b l o o d c . A o r t a & (i i i) T a k e s a w a y d e o x y g e n a t e d b l o o d d . P u l m o n a r y a r t e r y & (i v) B r i n g s o x y g e n a t e d b l o o d \end{matrix}

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