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 contract, then blood goes into lower left chamb 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 force 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) G and (ii) H ?
(d) What are chambers (i) G and (ii) H ?

Answer

(a) Heart (b) (i) Pulmonary vein (ii) Aorta (iii) Vena cava (iv) Pulmonary artery (c) (i) Left atrium (ii) Left ventricle (d) (i) Right atrium (ii) Right ventricle