Mark the following statements as true or false. Correct the false statements.
(a) The function of kidney is to store urine.
(b) The blood is sent to all parts of the body from the right side of the heart through the aorta.
(c) Blood gets its red colour due to haemoglobin which is present in plasma.
(d) White blood cells fight disease causing germs.
(e) The excretory system helps in removing undigested food.
(f) It is necessary to match blood types before transferring blood to a patient.
(g) The pulmonary vein carries blood from the heart to the lungs.
(h) The exchange of gases and food materials take place through the walls of the capillaries.
(i) Your pulse rate increases when you are cycling.
(j) Arteries are thick walled and have valves.

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Solution

(a) False
The function of the kidney is to excrete urine.

(b) False
Blood is sent to all parts of the body from the left side of the heart through the aorta.

(c) False
Blood gets its red colour because of haemoglobin, which is present in RBCs.

(d) True

(e) False
The excretory system helps in removing nitrogenous wastes.

(f) True

(g) False
The pulmonary vein carries blood from the lungs to the heart.

(h) False
The exchange of gases and nutrients takes place through the walls of capillaries.

(i) True

(j) False
Arteries are thick walled and do not have valves.

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Question 21
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.

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.

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

Right atrium, Left atrium, Right ventricle, Left ventricle, Pulmonary, Systemic Aorta, Veins

The one-wav flow of blood in the human heart is from .........( 1) ......... where blood pour in oxygen enters, the ........ .(2). ........ which pumps blood through the .........( 3) ......artery to the lungs.Oxygen-rich blood returns to the heart by way of pulmonary..........(4).........,which empty into the .........( 5) .......... Then blood moves to the ......... (6) ......... which pumps the blood through the ......... (7) ......... and then to all the arteries of the body except those carrying blood to the lungs.

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