Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 22, Problem 22.4PS
The Equilibrium Potential. Answer each of the following questions with respect to ECl, the equilibrium potential for chloride ions. The chloride ion concentration inside the squid giant axon can vary from 50 to 150 mM.
(a) Before doing any calculations, predict whether ECl will be positive or negative. Explain.
(b) Now calculate ECl, assuming an internal chloride concentration of 50 mM.
(c) How much difference would it make in the value of ECl if the internal chloride concentration were 150 mM instead?
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Question 5
You measure the membrane potential and find that it does not change from time X to time Y. However, you find that current across the membrane has increased by a factor of 4 from time X to time Y. Which of the following most likely happened between time X and Y?
a.
4 times as many ion channels closed on the cell membrane
b.
Resistance of the membrane changed to ½
c,
Resistance of the membrane changed to ¼
d.
not enough information
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Question 10
A hypothetical cation has a Nernst potential of -30 mV. At 0 mV, the cation flows in which direction?
Into the cell
Out of the Cell
It does not flow
Only a few. Why do only a small number of sodium ions need to flow
through the Na+Na* channel to change the membrane potential
significantly?
Chapter 22 Solutions
Becker's World of the Cell (9th Edition)
Ch. 22 - Ouabain is an African plant derivative that has...Ch. 22 - You have isolated a toxin from a previously...Ch. 22 - The poison produced by some species of Central and...Ch. 22 - Drugs that affect the reuptake of...Ch. 22 - The Truth About Nerve Cells. For each of the...Ch. 22 - QUANTITATIVE The Resting Membrane Potential. The...Ch. 22 - QUANTITATIVE Patch Clamping. Patch-clamp...Ch. 22 - The Equilibrium Potential. Answer each of the...Ch. 22 - QUANTITATIVE Heart Throbs. An understanding of...Ch. 22 - The All-or-None Response of Membrane Excitation. A...
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- Please ASAP. Thankyou. Question 7 A hypothetical anion has a Nernst potential of -100 mV. At resting membrane potential (-70 mV), the anion flows in which direction? a. not enough information b. Into the cell c. Out of the Cell d. It does not flowarrow_forwardProblem. A 1-year-old child was admitted to the clinic with signs of damage to the muscles of the limbs and trunk. After the examination, carnitine deficiency in the muscles was revealed. Disruption of which transport process is the basis of this pathology? Explain the mechanism of this transport.arrow_forwardMembrane Receptors and Medicine. A patient, who has a stressful job, comes in with high blood pressure. The doctor prescribes beta-blockers to the patient. Explain what beta-blockers are and how these drugs help to bring down blood pressure to normal.arrow_forward
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- Ca2+ Using Figure 8.1, answer the following questions: 6) What is occurring in Step 2 of the figure above, and how is that process originated? 6) 7) Identify the structures on the postsynaptic membrane that bind with the neurotransmitter 7) in Steps 4 and 6 of the figure above, and indicate their function. 8) In the figure above, the overall function of Steps 6-8, which occur simultaneously, is to 8) 9) Based on the figure, describe the two possible mechanisms whereby Step 5 can occur on the postsynaptic membrane. 9) 10) Based on the figure, identify the structure in Step 6, if this presynaptic neuron is cholinergic. What if the neuron is adrenergic? 10)arrow_forwardPlease ASAP. THankyou. Question 17 If you completely inhibit the Na+/K+ ATPase, which of the following would you most likely observe? Decrease in Na+/Ca++ exchanger activity The Nernst potential for K+ would become more positive Intracellular Na+ concentration would increase All of the abovearrow_forwardPlease ASAp. Thankyou. Question 4 The resting membrane potential is a negative value because of: a. High K+ inside of cells compared to the outside b. Open K+ channels at rest c. Phospholipid head groups on the inside of the membrane d, High sodium outside the cellarrow_forward
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