Frog Heart Lab Report

Frog Heart

Exercise 1: Baseline Data

Using the Horizontal Compression buttons and the scroll bar, display the data  you wish to include in your report.

1. Observe the heart and describe its behavior. Is this behavior consistent with what is shown in the data above?

1. Observe the heart and describe its behavior. Is this behavior consistent with what is shown in the data above?

Answer

The heart of the frog rhythmically contracts and relaxes. This behavior is supported by the general fluctuations observed force values and the consistent patterns of the ECG occurring in regular intervals.

Study Questions

2. Explain the basis for the delay between the atrial and ventricular contractions.

2. Explain the basis for the delay between the atrial and ventricular contractions

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Answer

3. Describe the relationship between the ECG QRS complex and the beginning of ventricular contraction. What is the physiological significance of this relationship?

The A-V node and its adjacent conductive fibers mainly cause the delay. Conduction in the transitional, nodal, and A-V bundles is dampened by the decreasing number of gap junctions along the pathway of conduction, creating great resistance against the conduction of excitatory ions from one fiber to another. This ensures that the atria completely empty blood into the ventricles before ventricular contraction occurs.

3. Describe the relationship between the ECG QRS complex and the beginning of ventricular contraction. What is the physiological significance of this relationship?

Answer

The QRS waves occur as a result of the electrical depolarization of the right and left ventricles, an event that triggers ventricular contraction and the subsequent rise in ventricular pressure. This complex is used to determine the axis of the ECG

Exercise 2: Temperature Effects

Using the Horizontal Compression buttons and the scroll bar, display the data you wish to include in your report....