Muscle Lab Report Essay

1939 Words Apr 29th, 2013 8 Pages
Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Muscle Twitch

Study the data for the three muscles in Tables 1A, 1B, and 1C.

1. Make a scatter plot graph in Microsoft Excel® using Data Tables 1A, 1B, and 1C that show the twitch tension timelines of the eye, rectus
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The phenomenon occurs due to the increase in temperature because of an increase in cell activity. The improvement comes because the enzymes and proteins in the system become more efficient at a slightly higher temperature. This is somewhat analogous to how an increase in temperature increases the rate of chemical reaction.

Exercise 3: Wave Summation (Temporal Summation)

1. Look over the data in Data Table 3.

Data Table 3: Wave summation||

2. Graph a scatter plot for wave summation of time vs. tension graph using Microsoft Excel®.

3. Use arrows to indicate where the subsequent stimuli occurred on the graph.


A. Explain why wave summation occurs.
A sustained contraction of muscles, caused by the rapid firing of nerve impulses.

B. Can summation go on infinitely? Why or why not?
No they will not because the combination of responses from a motor unit that has had two or more stimuli applied to it in quick succession. A motor unit of a muscle responds to a single stimulus with a simple twitch response. When a second stimulus is applied to the motor unit before the response to the first is completely lost, the two responses combine to produce a greater muscle tension than that produced by a single response. If stimulation continues, the combination of the

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