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Frog Lab

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1. Explain how the different solutions affected the frog heart. Be sure to include specific information from the lab and then relate the results to how the heart functions in the body normally and in conjunction with the sympathetic and parasympathetic nervous system.
The regular solution values throughout the experiment for amplitude, interval, frequency, cardiac output is as respectively followed, 4.9, 0.96, 62.5, and 307. The cold solution caused the amplitude, interval, frequency, and cardiac output to change respectively to 4.7, 1.34, 44.7, 211. The effects of this cooling cause a decrease in heart rate, the rate of enzymic action, and the rate that channels open and close. The adrenaline outputs also changed to 6.2, 0.76, 78.9, and 490. …show more content…
Explain the normal ECG pattern. Relate the peaks and troughs to what is occurring in the heart. Also describe how the lub dub sounds of the heart relate to the ECG pattern and where in the pattern these sounds are made.
The normal ECG pattern includes clear P-waves, QRS complexes, and T waves. The P wave is produced during atrial depolarization. The pressure in the ventricle increases when the ventricle myocardium contracts and closes the AV valves. The QRS complex is created by repolarization of the atria and depolarization of the ventricles. The T wave is produced by repolarization of the atria and the depolarization of the ventricles. This relaxation causes the SV valves to close. The lub sound made by the heart is the closing of the atrioventricular valves and can be heard around the QRS complex, while the dub sound is created by the closing of the semilunar valves around the T wave. (Meaning of Heart …show more content…
The P-R and R-T waves do not change. The time between cardiac cycles also decreases. (ECG and Exercise) One of the abnormalities shown in this exercise was a double peak at the QRS wave. The two branches of the AV bundles have slightly conduction velocities, causing the double peak. In the second abnormality, the P wave is present only two out of three times. Since the P wave is not present the atria are not contracting properly. In the last abnormal ECG, the P wave is not clearly seen and the baseline is wavy. The wavy baseline is caused by a ventricle flutter creating multiple T waves. (Abnormal

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