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Animal Physiology Lab Report

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Animal Physiology Lab Report
03 - 03 - 2006

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The amount of neural discharge due to stimulation of tactile sensilla receptor is posted on figure 1.

FIGURE 1: Mean action potential activity of tactile sensilla receptors in femural of cockroach.

In this experiment, it was found that there exists a spontaneous resting activity within the cockroach tibia even though tactile sensilla receptors have not yet been stimulated. From figure 1 it can be observed that the mean spontaneous resting activity of the cockroach leg is (42+/-9.7) action potentials/sec. After the tactile sensilla receptors were stimulated by moving the receptor with and against direction of growth there was an increase of action potentials. From figure 1 it can be seen that tactile sensilla receptors are least sensitive when stimulated with their direction of growth which resulted in mean of (94+/-9.9) action potentials/seconds. However, from figure 1 it can be observed that tactile sensilla receptors are most sensitive when stimulated against their direction of growth which resulted in mean of (197+/-12) action potentials/second.

After performing Mann-Whitney U statistical tests it was found that the results are statistically highly significant as seen on table 1. When tactile sensilla receptors are stimulated in any direction, there is a significant change in action potential activity with a statistical p value of less than 0.01. Also the results found about the sensitivity of tactile sensilla receptors are statistically highly significant (p<0.01).

TABLE 1: Neural discharge activity within femoral of cockroach and statistical significance:

INDIVIDUAL #

SPONTANEOUS (SPIKES/SEC)

WITH DIRECTION OF GROWTH (SPIKES/SEC)

AGAINST DIRECTION OF GROWTH (SPIKES / SEC)

STATISTICAL SIGNIFICANCE:

1

34

80

198

Between spontaneous and with direction of growth:

P<0.01

Highly Significance

2

56

88

178

3

23

90

208

4

45

79

201

5

32

100

206

6

34

101

198

7

36

88

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