Biology Forums - Study Force

Delivering single shocks in succession to stimulate the frog heart _______.
    increased the height of the ventricular systole wave
    did not increase the height of the ventricular systole wave
    resulted in wave summation
    resulted in fused tetanus

The doublet that results with more frequent stimulation of the frog heart represents _______.
    an extrasystole
    an extrasystole and an extra contraction of the atria
    an extra contraction of the atria
    an extra contraction of the ventricles
    an extrasystole and an extra contraction of the ventricles


When the ventricles beat rapidly in succession, _______.
    a doublet representing two atrial contractions followed
    wave summation occurred
    the second peak was higher than the first
    a compensatory pause followed


When multiple stimuli were applied at 20 stimuli/sec, _______.
    fused tetanus occurred
    triplets representing three ventricular contractions occurred
    extrasystoles were produced
    atrial contractions completely disappeared

An extrasystole and an extra contraction of the ventricles.

1-b
2-e
3-d
4-c