Question
(ii)Which of the following muscles help during inhalation. (a) External intercostal muscles (b) Internal intercostal muscles (c) Both (a) and (b (d) None of these
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Question
(i) How many breaths per minute is the person taking when at rest? (a) 15 (b) 15 (c) 17 (d) 20 It is clear from the given graph that the person is taking 5 breaths per 20 sec,so in 1
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Question
(iii)After entering into the tissues, the arteries are divided into a)aorta (b)atrium (c)capillaries (d)veins
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Question
ii)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  
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Question
i)A blood vessel which carries blood back to the heart is : a)artery (b)vein (c)capillary (d)platelet
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