Crayfish Lab Report Composition

Crayfish Laboratory Report

A. Avril lavigne

Crayfish Laboratory Report

Nov 9, 2012

Dr . Marvin


Number 1 . Firing Rate of Tonic Radio in Response to Stretch. The correlation among Firing Charge and Stretch of the gradual adapting crayfish receptor for four diverse sets of data is represented in this physique. The songs are used at stretches of 2, 4, 6, 8, and twelve mm with the crayfish butt. The best in shape lines pertaining to the different units of data will be as follows: Ali and Emily- Linear best suit line, Sawzag and Laura- Exponential best fit line, Jimmy and Amina-Exponential best fit collection, Tala and Jen-Linear best fit line).

Figure installment payments on your Class Average for Firing Rate of Tonic Receptor in Response to Stretch. The firing price of the slow-adapting receptor neuron in response to stimulus, which this experiment is the extending of the Crayfish tail in 2, 5, 6, almost eight and twelve mm.

Determine 3. Rate of Edition of Tonic Receptor kept at Regular Length (6mm). The best in shape line for the rate of adaptation of the Tonic receptor is Logarithmic. At a constant stimulus, your initial firing tipp drops and levels away at a consistent firing rate representing arsenic intoxication a stimulus.

R2 Ideals for Linear, Exponential and Logarithmic Lines for each Info Set В | Curve Type| R^2

Tala, Jen| Linear| 0. 982

| Exponential| 0. 982

| Logarithmic| 0. 982

Dave, Laura| Linear| 0. 982

| Exponential| zero. 982

| Logarithmic| zero. 746

Jimmy, Amina| Linear| 0. 950

| Exponential| 0. 976

| Logarithmic| 0. 824

Ali, Emily| Linear| 0. 988

| Exponential| zero. 934

| Logarithmic| zero. 965

Class Average| Linear| 0. 995

| Exponential| 0. 966

| Logarithmic| 0. 920


several. Frequency vs Stretch

a) In our class room experiment, following dissecting and preparing the crayfish tail, we taken up a MRO receptor neuron with our electrode to record shooting of the neurological as we modified the length of the crayfish tail using a thread attached to both micromanipulator and the end in the tail. As opposed to our classroom experiment, the methods for Delcomyn and Krnjevic and Vehicle Gelder's try things out dealt directly with the MRO strand, being more specific –the isolated belly stretch receptors of the crayfish. In Delcomyn's experiment, the MRO follicle was held each and every end simply by forceps and a microelectrode was inserted into the cell body with the sensory neuron. Gentle manipulations of the forceps caused without exercise in the MRO generating a generator potential in the strand that caused a spike potential in the sensory neuron. As stated before, methodically, Krnjevic and Vehicle Gelder's experiment didn't fluctuate significantly because they too interacted directly with all the MRO radio neuron. The independent varying in every experiment was your stretch put on the neuron. The centered variable pertaining to our class experiment and Delcomyn's test was the firing rate, yet Krnjevic and Van Gelder's experiment contained an additional based mostly variable—tension (which is linearly related to the firing rate).

b) In respect to Krnjevic and Van Gelder's Physique 7, stretch out and pressure are linearly related. The graphs disclose that with increasing anxiety, firing rate and anxiety increase steadily faster. The partnership of both equally tension and firing level to stretch out are dramatical (Krnjevic and van Gelder, 1961). Due to differences in each of our methodical strategies, our classroom experiment is definitely not directly just like Delcomyn or perhaps Krnjevic and van Gelder's. The author's data is much more comparable since Delcomyn and Krnjevic used stretch right to the MRO strand, so the stretch in mm can be directly comparable for the 2. In our class room experiment, we certainly have a much larger range mainly because we dealt with the entire crayfish tail, a lot of the movement in millimeters goes into lifting the end itself.


The best-fit shape for my personal results of firing level vs . stretch applied is exponential. Much like Delcomyn's results, my stretch out...

References: Nakajima, Shigehiro. " Adaptation in Stretch Radio Neurons of Crayfish. " В ScienceВ 1 ( 1964): n. pag. В

Delcomyn, Fred. " Encoding Stimulus Strength. " (n. deb. ): n. pag. В

Krnjevic, E., and D. M. Vehicle Gelder. " Tension Within Crayfish Expand Receptors. " J.

PhysiologyВ (1961): and. pag.