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Systole refers to the contraction of
(a)SA node
(b)AV node
(c)Major arteries
(d)Atria and ventricles

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Important Questions on Circulation
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During atrial systole,

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During ventricular systole,

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During joint diastole,

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Blood enters atrium during

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Adrenaline directly affects -

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Heart beats are accelerated by

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Parasympathetic nervous system

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The reason for walls of arteries to be thicker than those of veins is
