Question

Boundary Membrane A B Exercises 16–20: The membrane is indicated by the dashed line. No flow occurs across the outer boundary. Exercises 16–21: Concentrations (mM)$^a$ Ion A B K$^+$ 280 10 Na$^+$ 61 485 Cl$^-$ 51 485 $^a$ mM means millimoles per liter. 16. Only sodium may cross the membrane separating the two compartments. The temperature is 24°C. What is the equilibrium potential? 17. Only potassium ions may cross the membrane. The temperature is 18°C. What is the equilibrium potential? 18. Only Cl$^-$ ions may cross the membrane. The temperature is 36°C. What is the equilibrium potential? 19. The transmembrane potential is 1 millivolt, and the temperature is 18°C. How many ion species (Na$^+$, K$^+$, or Cl$^-$) are NOT in equilibrium? (Allow a small tolerance for round-off.) 20. The temperature is 36°C, and the transmembrane potential is –60 millivolts. How many ion species are NOT in equilibrium? (Allow a small tolerance for round off.)

          Boundary
Membrane
A
B
Exercises 16–20: The membrane is indicated by the dashed line.
No flow occurs across the outer boundary.
Exercises 16–21: Concentrations (mM)$^a$
Ion A B
K$^+$ 280 10
Na$^+$ 61 485
Cl$^-$ 51 485
$^a$ mM means millimoles per liter.

16. Only sodium may cross the membrane separating the two compartments. The temperature is 24°C. What is the equilibrium potential?

17. Only potassium ions may cross the membrane. The temperature is 18°C. What is the equilibrium potential?

18. Only Cl$^-$ ions may cross the membrane. The temperature is 36°C. What is the equilibrium potential?

19. The transmembrane potential is 1 millivolt, and the temperature is 18°C. How many ion species (Na$^+$, K$^+$, or Cl$^-$) are NOT in equilibrium? (Allow a small tolerance for round-off.)

20. The temperature is 36°C, and the transmembrane potential is –60 millivolts. How many ion species are NOT in equilibrium? (Allow a small tolerance for round off.)

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boundary membrane a b exercises 1620 the membrane is indicated by the dashed line no flow occurs across the outer boundary exercises 1621 concentrations mma ion a b k 280 10 na 61 485 cl 51 41398

Added by Hannah H.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Sri K

09/29/2022

Step 1

The Nernst equation is: $$E = \frac{RT}{zF} \ln\left(\frac{[ion]_{out}}{[ion]_{in}}\right)$$ Where: - $E$ is the equilibrium potential (in volts) - $R$ is the ideal gas constant (8.314 J/(mol·K)) - $T$ is the absolute temperature (in Kelvin) - $z$ is the valence Show more…

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Boundary Membrane A B Exercises 16–20: The membrane is indicated by the dashed line. No flow occurs across the outer boundary. Exercises 16–21: Concentrations (mM)$^a$ Ion A B K$^+$ 280 10 Na$^+$ 61 485 Cl$^-$ 51 485 $^a$ mM means millimoles per liter. 16. Only sodium may cross the membrane separating the two compartments. The temperature is 24°C. What is the equilibrium potential? 17. Only potassium ions may cross the membrane. The temperature is 18°C. What is the equilibrium potential? 18. Only Cl$^-$ ions may cross the membrane. The temperature is 36°C. What is the equilibrium potential? 19. The transmembrane potential is 1 millivolt, and the temperature is 18°C. How many ion species (Na$^+$, K$^+$, or Cl$^-$) are NOT in equilibrium? (Allow a small tolerance for round-off.) 20. The temperature is 36°C, and the transmembrane potential is –60 millivolts. How many ion species are NOT in equilibrium? (Allow a small tolerance for round off.)

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Transcript

0:00 Hello everyone.

00:01 So here we have the question and the answer to this question is to find out whether the ions in the cell are in equilibrium or not, we need to find or we need to satisfy the equation.

00:16 So the equilibrium equation for this particular case will be k plus ions plus any minus ions is equal to ca minus ions plus ca minus ions plus a minus ions.

00:33 Now if we just check over here, then we can say that the intracellular concentration will check first, the intracellular concentration.

00:46 So here if you check the kcl.

00:49 Kcl will be basically 150 by 2, that is 75.

00:54 Then we'll check for the nacl.

00:56 Nsl will be 10 by 2, that is 5.

01:00 Then we'll find out for the ka and this is equals to 150 by 2 again.

01:08 So this will be 75 again.

01:10 So now the extra cellular.

01:11 So this was the intracellular.

01:13 Now we'll go for the extra cellular concentration.

01:18 Extra cellular concentration.

01:21 So in this extra cellular concentration we can say that the kcl will be 10 by 2 that is 5.

01:30 Then for nacl, it is 150 by 2, that is 75.

01:38 And for ka, that is equal to 10 by 2, so that is 5.

01:43 So now if we just check for cell 1, cell 2, cell 3 and cell 4...

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