ne Templates x x HHIM Neurophysiology Virtual Lab.dod x 2. Go to ractive/vlans/n
ID: 167109 • Letter: N
Question
ne Templates x x HHIM Neurophysiology Virtual Lab.dod x 2. Go to ractive/vlans/neuropnysiology/ start on the Background Information Tab and click on the Background Information About the Leech, the Nervous system and Electrical Equipment. Answer the following questions in the spaces provided. Look at figure 49.2 in your textbook to compare a nervous system with other organisms. What are three reasons why the leech good candidate for our dissection? During the resting potential state what causes the potassium ions to stop moving down the concentration gradient? Why does the specimen need to be in a salt solution? Why is the microelectrode used to penetrate the neurons made of glass? Column 66 Spell CheExplanation / Answer
Leech as a good candidate fro dissection.
a. As they can be easily collected and stored without any hassel.
b.Leeches have relatively large and easily manipulated nerved cord which can be extracted easily.
c. ganglions can be cultured.
d.Exhibit discrete behavior like swimming which can be used as a marker.
During resting potential what causes the potassium ions to stop moving down the concentration gradient.
When a neuron is at rest most of the ion channels are closed however some potassium channels are open permitting the potassium ions to diffuse out of the cell down the concentration gradient.the sodium ion channels are closed and hence exhibit no movement when the neuron is at rest .In a neuron the internal concentration of potassium is higher than the external concentration and hence diffuse out of the cell creating a diffusion gradient , simultaneously there is an increase in the negative charge within the cell and creates an electrical force thus there are two opposing forces created and potassium ions are now pulled by these two forces ,Initially the diffusion force drives K+ ions down their concentration gradient towards the exterior of the cell which in turn increases internal negativity which pu;;s back the k+ions back into the cell .
As the forces of diffusion and electrical forces balance and an electrical or voltage is reached and equilibrium is achieved there wil lbe no net movement of K+ ions out of the cell or into the cell.
3. The specimen needs to be kept in salt water to dehydrate and make it dry so that it is easy for dissection.
4. Microelectrodes are made up of glass because they can be easily filled and do not interfere with the procedure.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.