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⟩ If the heart of a resting normal person is increased from 60 to 90 beats per minute by artificial atrial pacing

* a) Cardiac output will increase by at least 50%.

* b) Stroke volume will not be affected appreciably.

* c) Cardiac output will not be affected appreciably.

* d) Arterial pulse pressure will increase.

* e) Central venous pressure will increase.

Answer - c

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