Mechanity And Intrinsic Cardiac Activity

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Intrinsic Cardiac Activity: The first peak of the electrocardiogram graph corresponded to the atrial contraction of the heart. The second peak of the electrocardiogram graph corresponded to the ventricular contraction of the heart. The third peak observed corresponded to the relaxation of the heart.
Frank-Starling Mechanism: There was no significant trend observed in ventricular contractile force in response to increasing imposed length of the heart (Fig 1a). A maximum ventricular contractile force of 0.0032 + 0.001039 N (N=3) was generated at an imposed length of 4 mm. A minimum ventricular contractile force of 0.00137 + 0.0000577 N (N=3) was generated at an imposed length of 0 mm.
There was no significant trend observed in heart rate in response to increasing imposed length of the heart (Fig 1b). A minimum heart rate of 31.7 + 0.577 beats/min (N=3) was
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2a). A maximum ventricular contractile force of 0.00137 + 0.0000577 N (N=3) was observed upon no additions. Following the addition of epinephrine, a significant decrease of ventricular contractile force from 0.00137 + 0.0000577 N (N=3) to 0.00103 + 0.000153 N (N=3) was observed. A significant decrease of ventricular contractile force from 0.00137 + 0.0000577 N (N=3) to 0.000833 + 0.0000577 N (N=3) was observed after the addition of eserine. After the addition of atropine, no significant difference in ventricular contractile force was observed when compared to the baseline value. Following the addition of acetylcholine, a significant decrease in ventricular contractile force from 0.00137 + 0.0000577 N (N=3) to 0.000767 + 0.000153 N (N=3) was observed. This was also the minimum ventricular contractile force

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