Nervous Physiology Revievw 1. The volt is a measure of membrane 2. Charged parti

Question

Nervous Physiology Revievw 1. The volt is a measure of membrane 2. Charged particles will flow between two points if an exists enough. This flow of electrically charged particles is ca charges in the extracellular charges in the intracellular fluid. This separation of charge is What is the difference between the terms "membrane potential" and "resting membr resistance is The plasma membrane separates from the 3. 4. potential"? 5. By convention, membrane potentials are expressed in terms of the excess charge the cell. The typical neuron has a resting potential of 6. List three factors that contribute to the generation of the resting membrane potent 7. How does the sodium-potassium pump contribute to the resting membrane pot List and describe the four ion channels involved in nerve and muscle electrical

Explanation / Answer

1)Potential

2)charged particles will move between cation and anion and this process of flow of electrically charged particles is called electric current

3) Na+, K+ Cl- in theextracellular fluid

K+, Na+, proteins, amino acids, sulfate, phosphate (A-) in the intracellular fluid

seperation of charges from ECF and ICF is known as membrane potential

4) membrane potential: membrane potential is defined as the difference in the electrical potential between the interior and exterior of the cell.The membrane potential of a cell range from –40 mV to –80 mV.

resting membrane potential: membrane potential existing across the cell membrane at rest is known as resting membrane potential in muscle the resting membrane potential rages from -80 to -90 mV.

5)excess positive charge is present outside the cell during rest and the resting membrane potential of the nerve is -70mV

6)factors responsible for resting membrane potential are

a)the concentration of the ions on the inside and outside of the cell

b)cell permeability

c)electrochemical gradients and channels

7)During rest, the permeability for potassium ions become higher.hence, potassium ions move out of the cell this in turn takes away the positive charges from within the cell.sodium potassium pump acts and inside of the cell become more negative thus membrane potential generates and that is called electrogenic pump.

the four ion channels are

voltage-gated, ligand-gated(extracellular),ligand-gated(intracellular),stress-activated

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