Human Biology Essay

Please include the recorded charts along with this report. Charts may be copied to MS Power Point. Exercise 1: The effects of nerve stimulation A. Describe briefly what you have done for this section (maximum 100 words). The following settings were set up on the dialog box of the Stimulus Isolator. Where the start delay was set at So, the Max repeat at 1 Hz’s, the repeats at infinity, the pulse width at pops and the pulse current at mama.

The position of the thumb giving the largest twitch was located, and the electrode was then taped in position. No recordings were done in the first exercise for the objective in exercise one is to find the position of the electrode placed on the lunar nerve on the wrist that would give the largest twitch. B. What are the observations that you have made? (maximum 150 words) When the stimulator switch was turned on there is an observable twitch on the thumb of the volunteer. Exercise 2: Twitch response and recruitment pulse width at pops and the pulse current at 0. Ma. The pulse current was increased gradually by 0. AMA until a response was recorded. A comment was added to the recording to note the pulse current used when there is a response. This process was continued until the responses does not increase.

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What was the smallest current required to produce a contraction (the threshold current)? The smallest current required to produce a contraction is at 7. AMA. 3. What was the smallest current required to produce the maximum (largest) contraction? The smallest current required to produce the largest contraction is at 9. Mom. 4. What happened to the number of fibers contracting as the current was raised from horseshoe to that required to produce a maximal contraction? 5. Why does varying the stimulus strength affect the twitch force?

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