The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and...
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. When an ion channel opens in a cell wall, monovalent (charge ee) ions flow through the channel at a rate of 1.0×107ions/s1.0×107ions/s. The potential difference across the ion channel is 70 mVmV. What is the power dissipation in the channel?
Homework Answers
number of ions per sec = 10^7 ion / sec
current = I = number of ions per sec * charge of each ion
I = 10^7 * 1.6 X 10^-19 = 1.6 X 10^-12 Amp
potential difference = V = 70 x 10^-3 V
power = p = V * I = 70 X 10^-3 * 1.6 X 10^-12 = 112 X 10^-15 Watt
P = 112 x 10^-15 Watt
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The biochemistry that takes place inside cells depends on
various elements, such as sodium, potassium, and...
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and...
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. High-resolution measurements have shown that an ion channel is a 0.30-nm-diameter cylinder with length of 5.0 nm. The intracellular fluid filling the ion...
Constants Part A The biochemistry that takes place inside cells depends on various elements, such as...
Constants Part A The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. High-resolution measurements have shown that an ion channel is a 0.30-nm-diameter cylinder with length of 5.0 nm. The intracellular fluid...
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Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10-3 mol/liter inside the cell and 4.5 x 10-3 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 10-9 m2/s. A. What is the difference in concentration, Δc across the cell wall in molecules/m3? B. What is...
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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
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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...
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Constants Part A The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. High-resolution measurements have shown that an ion channel is a 0.30-nm-diameter cylinder with length of 5.0 nm. The intracellular fluid...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10*3 molliter inside the cell and 4.5 x 10 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 109 m2ls. What is the difference in concentration, Δc across the cell wall in molecules/m3? molecules/m Submit Request Answer...
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...
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