1. Define the following terms Potential difference - Membrane potential Equilibr
ID: 3474916 • Letter: 1
Question
1. Define the following terms Potential difference - Membrane potential Equilibrium potential 2. How are electrical potentials established in biological systems: 3. How can a cell change the level of resistance across a membrane: 4. Using table 4.1 of your text (or a comparable textreputable internet site) identify normal ICF (inside) and ECF (outside) concentrations for each of the following ions lon i Inside (ICF) concentration Outside (ECF) concentration Potassium [K· Sodium [Na"] Calcium (Ca?"] Magnesium (Mg] Chloride [CH Protein (A-] 5. Which of the ions in the table are found highest in concentration outside of the cell (ECF) 6. Which of the ions in the table are found highest in concentration inside of the cell (ICF) 7. Using the values in the table above and the Goldman-Hodgkin-Kats (GHK) equation (shown below), calculate the membrane voltage (Vm) under normal conditions. (PNa -1,P-25)Explanation / Answer
1. (A) Potential difference : An electric potential difference exist between interior and exterior of the cell.
1. (B) Membrane potential: difference in concentrations of ions on opposite side of a cellular membrane lead to a voltage called the membrane potential..
1. (C) Equilibrium potential : It is membrane potential where the net flow through any open channel is zero.
2 electrical potential develops in biological system originates from the various sources such as the existence of free ions in the biological system, ionized molecular group or electrical polarization molecular groups.
4. ICF K = 150 and ECF = 4.3, IFC Na = 10 and ECF = 142, ICF Ca = 0.01 and ECF = 5.00, IFC Mg = 40 and ECF = 3, ICF Cl= 2 and ECF = 104, ICF protein = 40 and ECF = 16.
5. Sodium has highest ECF = 142 in the above table
6. potassium has highest ICF = 150 in the above table
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