Question

In: Anatomy and Physiology

Dr. Woodley is trying to explain the concepts of resting membrane potential, equilibrium potential, and membrane...

Dr. Woodley is trying to explain the concepts of resting membrane potential, equilibrium potential, and membrane potential to the students in her laboratory. To do this, she uses a dish of cultured motor neurons so that she can alter the solution covering the cells and she can use a recording electrode to pierce one of the cells and determine its membrane potential relative to the extracellular fluid. She asks you a number of questions before and after she alters the conditions around the cell. The normal media (fluid covering the cells) contains: 145 mEq/L Na+        5 mEq/L K+                 and 2 mEq/L Ca++

and the intracellular fluid contains:

15 mEq/L Na+          155 mEq/L K+               and 0.0001 mEq/L Ca++(12)

1. List the factors that normally account for resting membrane potential. (3)

2. Dr. Woodley then measures the resting membrane potential (RMP) of the motor neurons and monitor that graphically displays the charge indicates that it is -90 mV. What does this tell you about the influence of the ions listed above on RMP? Why would this occur? (3)

She then changes the media so that the new media is still isotonic to the previous media, but it now contains 110 mEq/L Na+, 5 mEq/L K+, and 27 mEq/L Ca++and she asks you the following questions:

3. Has the equilibrium potential changed for any of the ions? If so, which ones changed, and which one did not? (3)

4. Given the changes made to the media, would the resting membrane potential of the cell change? Why? Or why not? (2)

Solutions

Expert Solution

Dear Student ,

Hope you are clear ?


Related Solutions

Dr.W is trying to explain the concepts of resting membrane potential, equilibrium potential, and membrane potential...
Dr.W is trying to explain the concepts of resting membrane potential, equilibrium potential, and membrane potential to the students in her laboratory. To do this, she uses a dish of cultured motor neurons so that she can alter the solution covering the cells and she can use a recording electrode to pierce one of the cells and determine its membrane potential relative to the extracellular fluid. She asks you a number of questions before and after she alters the conditions...
Membrane Potential The resting membrane potential of a neuron is _________.   The membrane potential changes when...
Membrane Potential The resting membrane potential of a neuron is _________.   The membrane potential changes when _________. A change in membrane potential to a more positive value is called __________ and a change to a more negative value is called _______. Ions flow through _________ which are controlled by voltage and ________ which are controlled by _________. Neurons communicate with other neurons and targets by generating _________. Ghe neuron generates an action potential only if it reaches a threshold voltage...
1a) How does "Membrane Resting Potential" differ from "Membrane Equilibrium Potential"? 1b) What is Node of...
1a) How does "Membrane Resting Potential" differ from "Membrane Equilibrium Potential"? 1b) What is Node of Ranvier? 1c) What is respiratory quotient? 1d) Is muscle contraction required for exhalation?
Define resting membrane potential and action potential (1 point). Why is the resting membrane potential negative...
Define resting membrane potential and action potential (1 point). Why is the resting membrane potential negative and close to the K+ equilibrium potential when cells are at rest, and then positive and closer to the equilibrium potential of Na+ when activated (4 points).
Topic 2: Resting membrane potential Describe how a resting membrane potential is established in the wrong....
Topic 2: Resting membrane potential Describe how a resting membrane potential is established in the wrong. and your answer be sure to include A definition of membrane potential The resting membrane potential of neurons What does this value mean What ions are involved in establishing the resting membrane potential? What are the General concentration effects on resting membrane potential? why? The answer should include descriptions of relevant permeabilities, equilibrium potential, and concentration gradients. What is the role of the sodium-potassium...
The resting surface charge density of a membrane is 0.5 uC/cm^2. The resting membrane potential is...
The resting surface charge density of a membrane is 0.5 uC/cm^2. The resting membrane potential is 0.5 V. It drops to 0 V in 5 ms. If there are 25 Na channels per um^2 that open up during depolarization, what is the average current that flows through a sodium channel during this time (5 ms)? How many sodium ions move through the channel in 5 ms?
Describe the resting membrane potential and the forces at play in a resting neuron concisely, but thoroughly
Describe the resting membrane potential and the forces at play in a resting neuron concisely, but thoroughly. At minimum, the following terms/concepts should be explained in your response: membrane potential, ion channels (and the two main ions involved, and their relative distribution), the two types of forces/pressures acting on each of the ions, and the special transporter of these two ions (and what it does). Here is a previous answer I got(it was great!)- please build off it though, and...
Describe the resting membrane potential and the forces at play in a resting neuron concisely, but thoroughly.
Describe the resting membrane potential and the forces at play in a resting neuron concisely, but thoroughly. At minimum, the following terms/concepts should be explained in your response: membrane potential, ion channels (and the two main ions involved, and their relative distribution), the two types of forces/pressures acting on each of the ions, and the special transporter of these two ions (and what it does).  
1. The membrane is more permeable to K+ than to Na+: a. At resting membrane potential...
1. The membrane is more permeable to K+ than to Na+: a. At resting membrane potential b. During the depolarization phase of an action potential c. After a neurotransmitter in an excitatory synapse binds to the postsynaptic cell d. More than one of the above is correct 2. During an action potential, the depolarization of the neuron membrane is the result of: a. Sodium moving into the cell b. Potassium moving into the cell c. Sodium moving out of the...
1) What is meant by the term ''resting membrane potential''? 2) What is the usual resting...
1) What is meant by the term ''resting membrane potential''? 2) What is the usual resting membrane potential of an excitable cell (e.g.neuron) at rest? Why? How is it established? 3) How do the concentration of K+ and Na+ differ in the ECF and the ICF?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT