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Animal Physiology Lab Report: Mechanoreceptors Of Cockroach

1647 words - 7 pages

03 - 03 - 2006
ResultThe 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

199

Between Spontaneous and against direction of growth:
P<0.01
Highly Significance

8

34

98

178

9

38

87

186

10

59

78

185

11

50

103

190

12

34

105

193

13

56

110

176

Between with direction of growth and against direction of growth:
P<0.01
Highly Significance

14

54

103

204

15

38

96

207

16

40

110

203

17

41

91

210

18

44

94

221

19

49

89

196

20

48

105

199

AVERAGE:

42

95

197

DEVIATION:

9.7

9.9

12

Discussion:In this study we observed when cockroach tactile sensilla receptor detect signals such as air movement or touch initiates action potential activities higher than its spontaneous resting activity. This result was highly significant (p<0.1). With great significance, (p<0.01) we also observed that if tactile sensilla receptor are stimulated against their direction of growth, they will initiate more action potentials than if they are stimulates is received with...

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