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During isovolumetric contraction of vent...

During isovolumetric contraction of ventricles

A

Atrioventricular valves open

B

Pressure within ventricles decrease

C

Blood volume in ventricles remains constant

D

Semilunar valves remain open

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A : Isovolumetric systole of a normal cardiac cycle is responsible for the opening of semilunar valves causing the blood flow into aortic aorta and pulmonary aorta. R : During isovolumetric systole, intraventricular pressure increases as semilunar and AV valves are closed and ventricles are contracting .

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Knowledge Check

  • Refer to the given figure in which A refers to pulmonary artery pressure and B refers to right ventricular pressure. Identify P,Q,R and S in the figure and match with the list (i-iv) given below (i) Isovolumetric ventricular contraction (ii) Ventricular ejection (iii) Isovolumetric ventricular relaxation (iv) Ventricular filling

    A
    P-(iv),Q-(iii),R-(ii),S-(i)
    B
    P-(ii),Q-(iii),R-(i),S-(iv)
    C
    P-(iv),Q-(i),R-(ii),S-(iii)
    D
    P-(i),Q-(ii),R-(iii),S-(iv)

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