Figure shows schematic plant of blood circulation in humans with labels A to D. Identify the correctly marked label and its function/s.

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

P O_{2}

= 60 mm Hg

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B - Pulmonary artery takes blood from heart to lungs,

P O_{2}

= 90 mm Hg

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

P C O_{2}

= 45 mm Hg

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D - Dorsal aorta takes blood from heart to body parts,

P O_{2}

= 95 mm Hg

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Solution

The correct option is C C - Vena Cava-takes blood from body parts to right auricle, $P C O_{2}$ = 45 mm Hg
The correct labelling along with their functions and PO $_{2}$ levels for labels A to D are:
A- Pulmonary vein- takes pure oxygenated blood from the lungs to the heart. pO $_{2}$ = 95mm Hg
B- Dorsal aorta- takes pure oxygenated blood from the heart to body parts. pO $_{2}$ = 95mm Hg
C- Vena cava (great veins)- takes impure deoxygenated blood from body parts to the heart( right auricle). pCO $_{2}$ = 45mm Hg
D- Pulmonary artery- takes impure deoxygenated blood from the heart to lungs. pO $_{2}$ = 40mm Hg.
So, the correct answer is 'C- Vena Cava-takes blood from body parts to the right auricle, $P C O_{2}$ = 45 mm Hg.'

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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.

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. 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 following

\begin{matrix} Column I & Column II 1.Aorta & i. Carries deoxygenated blood from upper part of the body to the heart 2.Inferior vena cava & ii. Carries oxygenated blood from the lungs to heart 3.Superior vena cava & iii. Carries oxygenated blood from the heart to the other parts of the body 4.Pulmonary vein & iv. Carries deoxygenated blood from lower part of the body to the heart \end{matrix}

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