The following post has two assignments namely;

## 1.Precautionary Principle

Would you support the United States adopting the precautionary principle in all of its

legislation? Why or why not?

## 2.Conduction velocity data

Scenario:

Imagine you are a researcher that has collected conduction velocity (metres·sec-1) data

from 6 cockroach (Periplaneta americana) sensory neurons at varying temperatures to

submit to a scientific journal. You obtained the following raw data:

Table 1. Conduction velocity in tibial sensory neurons of Periplaneta

americana.

Cockroach Tibial Spines*

Temperature (°C) A B C D E F

10 1.6 1.1 1.3 1.6 1.8 1.4

15 1.7 1.5 1.5 1.9 1.9 1.8

20 1.8 1.9 1.8 2.4 2.1 2

25 2.5 2 2.4 2.7 2.6 2.3

*metres·sec-1

Using the data in Table 1, you decide to run a one-way repeated measures analysis of

variance (ANOVA) to test whether or not the means of several groups (Temperatures

10 – 25°C) are different. You choose a repeated measures analysis since each

cockroach leg was stimulated at multiple temperatures. You perform the appropriate

statistical analysis and find that there is a significant difference in the conduction velocity

with each 5°C increase in temperature (F = 61.02; d.f. = 23; P<0.001). You also perform

a linear regression analysis on the data and determine that there is a significant

correlation between temperature and conduction velocity (R2 = 0.99; d.f. = 1, 22; P =

1.12 X 10-7). The equation of the regression line was found to be y = 0.063x + 0.80.

Note that although the analyses were performed on the raw data, you should plot

summarized data in your figure. You should supplement the analyses above by

determining and presenting in your text the Q10 for the relationship between temperature

and conduction velocity (see prelab manual for formula).

Reflecting on this data, you should design a figure to present the summarized results

and write a Results section to the scientific manuscript in which you would be presenting

this data (found in Table 1 above).

. Pre-lab Assignment

a) Written Results [10 marks].

b) Figure [8 marks] and Figure Caption [6 marks].

2. List two characteristics that differentiate extracellular recordings from intracellular

recordings [2 marks]?

3. List one physiological mechanism/structure that may account for an increase in

conduction velocity as temperature is increased. Explain why this mechanism/structure

would be altered with a rise in temperature [2 marks]?