1.

The diagram given alongside represent the human heart in one phase of its activity. Study the same and then answer the questions that follows:(i) Name the phase. Which parts of the heart are contracting in this phase?(ii)  Give a reason to support your answer.(iii) Name the part labeled 1 to 6.(iv)  What type of blood flows through the parts marked ‘1’ and ‘2’?(v)  How many valves are closed in this phase?

Answer»

(i)  Ventricular systole. 

(ii)  Both ventricles are contracting in this phase, because both bicuspid and tricuspid valves are closed in order to prevent the back flow of blood into auricles and the semilunar valves are open. 

(iii)  1. Pulmonary artery 

2.  Aorta

3.  Pulmonary vein.

4.  Left Auricle

5.  Bicuspid valve (mitral valve)

6.  Right ventricle.

(iv)  ‘1’ – carries deoxygenated blood 

‘2’ --- carries oxygenated blood.

(v) Two (Bicuspid and Tricuspid) valves



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