match the following terms describing electrical events with the correct phases o

Question

match the following terms describing electrical events with the correct phases of the cardiac cycle

- The QRS complex directly preceeds this phase

- During this phase, Na+ entry through the funny channels causes the pacemaker potential of SA nodal cells to gradually become less negative until it reaches threshold

- the beginning of this phase corresponds with the T wave and the repolarization of the ventricle

- the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase

The following choices for the above are :

a) ventricular filling

b) isovolumetric relaxation

c) ventricular ejection

d) isovolumetric contraction

Explanation / Answer

The QRS complex directly preceeds this phase : d) isovolumetric contraction

During this phase, Na+ entry through the funny channels causes the pacemaker potential of SA nodal cells to gradually become less negative until it reaches threshold -- a) ventricular filling

the beginning of this phase corresponds with the T wave and the repolarization of the ventricle -- c) ventricular ejection

the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase -- b) isovolumetric relaxation

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