The diagram given below represents a section of the human heart.
Label the parts numbered $1$ and $2$ in the diagram. What type of blood flows through them?

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Solution

Part 1 is pulmonary artery. Deoxygenated blood flows through it to carry it away from the heart to the lungs.
Part 2 is pulmonary vein. Oxygenated blood flows through it to carry it from the lungs to the heart.

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The diagram given below represent the human heart in one phase of its activity. Study the same and then answer the question that follows:

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Q. The diagram given alongside represents the human heart in one phase of its activity. Study the same and then answer the questions that follow :
(a)Name the phase.
(b)Which part of the heart is contracting in this phase? Give a reason to support your answer.
(c)Name the parts numbered 1 to 6.
(d)What type of blood flows through the parts marked 1 and 2 respectively?
(e)How many valves are closed in this phase?