The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through a blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of pumping organ. Contraction of chamber G forces the deoxygenated blood into right lower chamber H. And finally the contraction of chamber H sends the deoxygenated blood into lungs through a blood vessel I. (a) What is organ A? (b) Name the blood vessel (i) B (ii) E (iii) F, and (iv) I. (c) What are chambers (i) C, and (ii) D? (d) What are chambers (i) G and (ii) H?
Answers
(a) What is organ A?
Ans: Heart.
Heart is the only organ that acts as a double pump,hence organ A is heart.
(b) Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
Ans:-
(i)B - Pulmonary vein
The oxygenated blood coming from the lungs through pulmonary vein enters the upper left chamber i.e left atrium of the heart.
(ii)E - Aorta
The contraction of left ventricle forces the blood to go into a blood vessel Aorta which supplies oxygenated blood to all the organs of the body (except the lungs).
(iii)F - vena cava
The deoxygenated blood coming out of the body organs is taken by a vena cava to the right upper chamber i.e right atrium of pumping organ.
(iv)I - Pulmonary artery
The contraction of right ventricle sends the deoxygenated blood into lungs through pulmonary artery.
(c) What are chambers (i) C and (ii)D?
Ans:-
(i)Chamber C is left atrium
Left atrium acts as a holding chamber for blood returning from the lungs and also as a pump to transport blood to other areas of the heart.
(ii)Chamber D is left ventricle
The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.
(d) What are chambers (i) G and (ii) H?
Ans:-
(i)Chamber G is right atrium
The right atrium receives deoxygenated blood from the superior and inferior vena cava and the coronary veins.
It pumps this blood into the right ventricle through tricuspid valve.
(ii)Chamber H is right ventricle
The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.
_______________