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Need help urgently. AS level Biology (Unit 1) Edexcel - Cardiac cycle

Ok. I am currently studying for my AS Biology where I am currently learning about the Cardiac cycle.

Ok. The teacher gave us a test where I have a picture of the heart in a "precise stage of the cardiac cycle". But the thing is....I can't tell from the picture in what stage it is. The picture the teacher gave us is in bad quality.

a) Can any of you fokes tell what stage of the cardiac cycle is this picture representing?

b) What are parts A and B. I am almost certain that A is the right ventricle.
11056599_928246627217634_2520007647339548631_n[1].jpg
this is the picture

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