(i) Label parts 1, 2 and 3.
(1) Name the phase shown in this figure and also
mention the time taken by it.
(iii) What do you understand by heart sound?
(iv) Draw a neat labeled T.S. diagram of Part 2 and 3
and also mention any two differences between them.
(v) Name the four types of Nodal tissue found in the
human heart
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Answer :label the parts : 1-left pulmonary artery 2- superior vena cava 3- aorta .
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