Homework Answers
If there is an equal distribution of ions inside and outside the neuron, there would not be any attraction. In other words, membrane potential would not occur.
The advantage of the unequal distribution is that there would be membrane potential. The ions can be attracted and can be moved across the body.
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How would an equal distribution of ions inside (intracellular) and outside (extracellular) the neuron affect the...
15. Given the following concentrations of ions in the intracellular and extracellular fluids of a cell;...
15. Given the following concentrations of ions in the intracellular and extracellular fluids of a cell; inside the cell: Na+ 12mM. K+ 150mM, CI-9mm, Ca2+0.0001mM and outside the cell: Na+ 145mM, K+ 5mM, CI- 125mM, and Ca2+ 2.5mM. Calculate the equilibrium potential for K+ (Ek) if its extracellular concentrations rise from 5 mM to 10 mM. Use the Nernst equation and the ion concentration to perform the following calculation. Comparing this to the normal Ek, is the change a depolarization...
A model cell contains the intracellular ions Na+, K+, Cl-, and An- (impermeant anions) and the...
A model cell contains the intracellular ions Na+, K+, Cl-, and An- (impermeant anions) and the extracellular ions Na+, K+, and Cl-. The concentration (activities) of [Na+]o=125 mmol l-1, [K+]o = 5 mmol l-1, whereas [An-]i = 123 mmol l-1, [K+]i= 112 mmol l-1. Assume the membrane is permeable to Na+, K+, and Cl-. [ The subscripts i and o refer to inside and outside, respectively]. The relative permeabilities for the ions are pNa/pK=0.02, pCl/pK=0.1 a) What are the values...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00380 M inside the cell, and a concentration of 0.145 M outside t...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00380 M inside the cell, and a concentration of 0.145 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 310 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow. (answer in mV) Answer: 696.77 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00300 M inside the cell, and a concentration of 0.115 M outside t...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00300 M inside the cell, and a concentration of 0.115 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 300 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow (answer in mV) Answer 04684 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...
You are studying a neuron from a newly discovered alien species, inside the neuron are many...
You are studying a neuron from a newly discovered alien species, inside the neuron are many positive charged proteins, P+ Outside the neuron are high concentrations of two negatively charged ions, X- and Y-. Another ion, Z+, also exists both inside and outside the cell (assume the rules of cell membranes, permeability, electric charges and ion channels are the same as a regular neuron on Earth). 1. In its default state, the alien neuoron's membrane is permeable only to Z+....
Potassium ions (K+) move across a 7.0-nm- thick cell membrane from the inside to the outside....
Potassium ions (K+) move across a 7.0-nm- thick cell membrane from the inside to the outside. The potential inside the cell is −80.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electric of the potassium ions as they move across the membrane?
2. Explain how the resting membrane potential of a neuron is established by a. Listing the...
2. Explain how the resting membrane potential of a neuron is established by a. Listing the important ions/molecules that contribute to the establishment of the membrane potential (there are 4) Describing which direction the ions/molecules flow (if at all; in or out of the cell?) Telling me which one of the ions/molecules is the MOST important for establishing the resting membrane potential and WHY b. c. Explaining how this ONE important ion/molecule flows through the membrane by describing the opposing...
1. If the membrane potential of sodium ions in a cell is equal to +60 mV,...
1. If the membrane potential of sodium ions in a cell is equal to +60 mV, what is its membrane potential for chloride ions if they are found in the exact same concentrations as sodium? Give your answer in mV. 2. Given a cell membrane with the following parameters- Ion Extracellular concentration (mmol/L) Intracellular concentration (mmol/L) Permeability K+ 10 150 1 Na+ 140 15 0.04 Cl- 100 7 0.45 calculate the membrane potential of the cell in mV. (Round your...
1) lon Flow (15 points): Consider a neuron (at body temperature) with a chloride concentration of...
1) lon Flow (15 points): Consider a neuron (at body temperature) with a chloride concentration of 15 mM inside the neuron and 150 mM outside the neuron. Assume that the neuron has a resting membrane potential of-50mV. Which direction will the chloride ions move if all chloride channels open? Does opening of chloride channels have an excitatory or inhibitory effect on the neuron? (5 points) a) -100mV. Which direction b) Assume that the neuron has a resting membrane potential of...
Potassium ions (K+)(K+) move across a 9.0-nm-9.0-nm-thick cell membrane from the inside to the outside. The...
Potassium ions (K+)(K+) move across a 9.0-nm-9.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is −60.0 mV,−60.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electricΔU electric of the potassium ions as they move across the membrane? Δ? electric = ... J?
15. Given the following concentrations of ions in the intracellular and extracellular fluids of a cell; inside the cell: Na+ 12mM. K+ 150mM, CI-9mm, Ca2+0.0001mM and outside the cell: Na+ 145mM, K+ 5mM, CI- 125mM, and Ca2+ 2.5mM. Calculate the equilibrium potential for K+ (Ek) if its extracellular concentrations rise from 5 mM to 10 mM. Use the Nernst equation and the ion concentration to perform the following calculation. Comparing this to the normal Ek, is the change a depolarization...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00380 M inside the cell, and a concentration of 0.145 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 310 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow. (answer in mV) Answer: 696.77 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00300 M inside the cell, and a concentration of 0.115 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 300 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow (answer in mV) Answer 04684 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...
2. Explain how the resting membrane potential of a neuron is established by a. Listing the important ions/molecules that contribute to the establishment of the membrane potential (there are 4) Describing which direction the ions/molecules flow (if at all; in or out of the cell?) Telling me which one of the ions/molecules is the MOST important for establishing the resting membrane potential and WHY b. c. Explaining how this ONE important ion/molecule flows through the membrane by describing the opposing...
1) lon Flow (15 points): Consider a neuron (at body temperature) with a chloride concentration of 15 mM inside the neuron and 150 mM outside the neuron. Assume that the neuron has a resting membrane potential of-50mV. Which direction will the chloride ions move if all chloride channels open? Does opening of chloride channels have an excitatory or inhibitory effect on the neuron? (5 points) a) -100mV. Which direction b) Assume that the neuron has a resting membrane potential of...
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