The film continues the tradition of Disney cartoons and musicals.
The atria are supposed to contract first, but in this case the ventricles contract first which is wrong and the heart has to then correct itself by pausing and waiting for the atria to contract again 1.
This is what feels like a skipped beat, and it appears like one too on an ECG because there is a big pause between atrial contractions. We will write a custom essay sample on Frog Lab Report or any similar topic specifically for you Do Not Waste HIRE WRITER To cause the ventricles to contract early, an electrical tumulus or one of many other problems that could potentially affect the heart, in this case it is electrical shock must be applied during atrial relaxation to cause the ventricles to contract before the atria.
Different chemicals, or reagents, cause different things to happen to the heart. Some reagents, like nor epinephrine, are released during stressful times and cause the heart rate to increase and contract with more force. This is an example of an excitatory neurotransmitter, which can be depleted in many ways, for example by a reagent that does the opposite of what it does, which would be to decrease heart rate 2.
Some reagents, like, cause the heart rate to dramatically decrease and could potentially be harmful if not corrected.
But, these effects can be inhibited by reagents like atropine and allow heart rate to return to normal. Others, like potassium chloride, could cause the heart to stop completely and are used for such methods like lethal injection in prisons.
Given all of this information, our hypothesis was that the frog hearts used in this experiment would follow the expectations that this background information tells us. When stimulated at the right time the heart would have an extra systole event, when iv en an excitatory neurotransmitter the heart rate and contraction force would increase, etc.
Before the dissection, the equipment and strength of the frogs heart beat needed to be tested. So, ECG pins were inserted in both shoulders and right thigh of the frog via small incisions made with scissors. We first tested lead l, which involved placing the ground pin in the right thigh, the positive pin in the left shoulder, and the negative pin in the right shoulder.
Once the pins were in place, the equipment was set up so that the settings were at single event mode, looms event interval, Oms event delay, 10ms pulse width, and single pulse.
The SIU was set at 1 mA range, positive polarity, and Finally, the transducer amplifier was set at bridge mode, filter, and 20 sensitivity. Once all of the equipment and the frog were set up, lead I ECG recordings were made until good records were recorded.
The R wave, duration of atrial depolarization, duration of electrical A-V delay, duration of ventricular depolarization, and duration of electrical ventricular depolarizations were then measured.
Then, the set up was changed to represent lead II, which only changed the location of the positive pin to the left thigh instead of shoulder. Once this change took place, the same Now that baseline recordings were measured, the frog could be dissected.
First, all four limbs were pinned to the dissecting pan with heavy pins. Next, the skin of the abdomen and chest and some of the neck was removed using forceps and scissors. It was removed in a rectangular shape, going across the abdomen and up the sides and then across the neck.
Then the muscle was removed in the same fashion, and the heart was visible. The pericardium was removed unintentionally during muscle removal, so it was not possible to observe it.
Now that the heart was visible and accessible, a piece of thread approximately 20cm long was looped on both ends. One end was attached to a Z pin, which was attached to the very end where the apex is because that is Just tissue.
The other end attached to an S-hook on a transducer connecting to the machinery and computer. The equipment and frog were positioned so that the string was taut when the ventricles relaxed.
The heart was kept moist with ringers throughout the entire experiment. Observing the heart beat via the ECG on the computer, the atrial and ventricle contractions were observed and noted as to where in the recording they were.
Once these were established, the single event button was pressed at the peak of each ventricular contraction, maximum ventricular relaxation, peak of each atrial contraction, and maximum atrial relaxation.
Now an extra-ventricular contraction needed to be made. When a response to the stimulus was seen, two beats were allowed to go by before stimulating the heart again.
Next, stimulus was applied to create the illusion of a heart blockage. The electrodes were rearranged to once again represent lead l, and thread was tied around the narrow groove of the heart between the atria and ventricles.
As the recordings continued, the string was tightened more and more until evidence of an A-V conduction block became apparent a ventricular beat did not follow every atrial beat.
Then the recording was continued until there was no ventricular contraction in the mechanical record. After these four tests were done, a new frog was used and dissected the same as the first one. The lead II setting proved to show better results than lead I during this experiment so that set up was used.Sample of Princess and the Frog Essay (you can also order custom written Princess and the Frog essay).
Review and pay your bill, sign-up to pay your bill automatically, and see the latest upgrade offers and deals. Sign-in to My Verizon today! Comparative Essay: The Frog Prince Vs The Princess and The Frog - Produced in , The Frog Princess is a Disney animation inspired by the Grimm Brothers’ fairytale, The Frog Prince.
Both The Frog Princess and The Frog Prince deal with a multiplicity of issues, all of which contribute to supporting positive messages and morals (Ceaser, Aug 08, · Free Essays from Bartleby | when his teacher would tell him about how the “Daddy frog was called a bull frog”, “and how the mammy frog laid hundreds of Home Page; Writing; Frogs Essay; Frogs Essay.
Compare and Contrast Death of a Naturalist, An Advancement of Learning. Frog Lab Report; Frog Lab Report. Given all of this information, our hypothesis was that the frog hearts used in this experiment would follow the expectations that this background information tells us.
When stimulated at the right time the heart would have an extra systole event, when iv en an excitatory neurotransmitter the heart rate and.
The Princess and the Frog highlights both ends of power distance, the low- power distance and the high-power distance. Eli “Big Daddy” La Bouff and her daughter Charlotte La Bouff exhibit the traits of a low-power distance family, while Tiana and her parents exhibit the traits of a high-power distance family.
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