Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN: 9781285866932
Author: Lauralee Sherwood
Publisher: Cengage Learning
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Chapter 3, Problem 2TAHL
Assume that a membrane permeable to
a.
b.
c. A membrane potential, negative on side 1, would develop.
d. A membrane potential, positive on side 1, would develop.
e. None of the preceding is correct.
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A hypothetical cell has a higher concentration of sodium ions outside the cell than inside the cell but an equal amount of chloride outside the cell and inside the cell. Based on its electrochemical gradient, which direction would chloride ions move across the cell membrane?
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Chapter 3 Solutions
Human Physiology: From Cells to Systems (MindTap Course List)
Ch. 3.1 - Draw how phospholipid molecules align themselves...Ch. 3.1 - Prob. 2CYUCh. 3.1 - Prob. 3CYUCh. 3.2 - Prob. 1CYUCh. 3.2 - Prob. 2CYUCh. 3.2 - Prob. 3CYUCh. 3.3 - Prob. 1CYUCh. 3.3 - Distinguish between passive and active forces that...Ch. 3.4 - List the means of unassisted membrane transport.Ch. 3.4 - Prob. 2CYU
Ch. 3.4 - Prob. 3CYUCh. 3.5 - Draw a graph comparing simple diffusion down a...Ch. 3.5 - Describe what causes the carrier to change shape...Ch. 3.5 - Distinguish between symport and antiport.Ch. 3.6 - Prob. 1CYUCh. 3.6 - Describe the relative contributions of k+ and Na+...Ch. 3.6 - Prob. 3CYUCh. 3 - The nonpolar tails of the phospholipid molecules...Ch. 3 - Prob. 2RECh. 3 - Prob. 3RECh. 3 - At resting membrane potential, there is a slight...Ch. 3 - Using the answer code on the right, indicate which...Ch. 3 - Prob. 6RECh. 3 - Prob. 7RECh. 3 - Prob. 1UCCh. 3 - Prob. 2UCCh. 3 - What two properties of a particle influence...Ch. 3 - Prob. 4UCCh. 3 - Prob. 5UCCh. 3 - Prob. 6UCCh. 3 - Describe the contribution of each of the following...Ch. 3 - Using the Nernst equation, calculate the...Ch. 3 - One of the important uses of the Nernst equation...Ch. 3 - Using the Goldman-Hodgkin-Katz equation, determine...Ch. 3 - When William H. was helping victims after a...Ch. 3 - Which of the following methods of transport is...Ch. 3 - Assume that a membrane permeable to Na+ but not to...Ch. 3 - A solution may have the same osmolarity as normal...Ch. 3 - Prob. 4TAHLCh. 3 - Prob. 5TAHL
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- Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process? a. It does not require ATP b. It is a form of active transport c. Movement is against the concentration gradient of Na+ d. The channel probably allows many different molecules and ions to crossarrow_forwardIf a cell with the following ion concentrations had a resting membrane potential of -40mV which of the following can you conclude? Extracellular: Cl- = 110 mM, Na+ = 145 mM, K+ = 5mM. Intracellular Cl- = 20 mM, Na+ = 10 mM, K+ = 140mM a) At rest it is only permeable to potassium b) At rest it has some permeability to more than one of these ions c) At rest it is only permeable to chloride d) Rest it is not permeable to sodiumarrow_forwardFor most neurons, the extracellular concentration of chloride ions (Cl-) is 108 mM, whilethe intracellular concentration of Cl- is 5 mM.If the plasma membrane becomes more permeable to Cl-, would there be Clinflux or Cl- efflux at an RMP of -70 mV? Why?arrow_forward
- Membrane lipids can move laterally with relative ease, but flip-flopping between layers takes much longer. True or False? The potassium channel is specific for potassium and not sodium because the pore in the channel is not large enough to fit sodium. True or False? The direction of spontaneous calcium transport depends only on its concentration on both sides of the membrane. True or False?arrow_forwardDuring an investigation on membrane transport, a researcher exposed bacterial cells to different concentrations of two different solutes: A and B. The rate of transport of each solute into cells isrepresented in the graphSolute ASolute BSolute ConcentrationWhich of the following best explains the greater rate of transport for solute A than for solute B at higher solute concentrations?A Solute A is being transported by simple diffusion, which does not rely on membrane proteins to control the rate of transportSolute A is being transported by active transport, which uses ATP and has higher rates of transport than passive transportSolute A is being transported by facilitated diffusion, which uses membrane proteins to increase the rate of transportRate of Transportarrow_forwardWhich of the following statements is false regarding the directions that forces of the eletrochemical gradient are pointing for each ion. Assume the membrane of the neuron is at rest. A. For chloride ions the electrostatic and diffusion forces are pointing in opposite directions. B For sodium ions the eletrostatic and diffusion forces are pointing in the same direction. C. For potassium ions the eletrostatic and diffusion forces are pointing in opposite directions. D. All options choices are TRUE regarding the forces of the electrochemical gradient on each ion. E. For calcium ions the electrostatic and diffusion forces are pointing in opposite directions.arrow_forward
- In the figure below are several panels that illustrate the relative concentration of a particular solute on either side of a cell's plasma membrane. The top panel represents the INITIAL (or starting) scenario, and the lower panels represent different possible outcomes after time has passed. QUESTION: Which of the panels below represents a situation in which the concentration gradient of this solute has been minimized (reduced)? A B C Darrow_forwardThe equilibrium potential for a given ion (Eion) is a theoretical value. For a given concentration gradient of an ion, the equilibrium potential is the charge inside the cell required to hold an ion at that concentration. That is, it is the charge required to perfectly oppose the drive of the ion to move down its concentration gradient. So, if the concentration of Nat is higher outside the cell than inside, its equilibrium potential (ENa) must be I and if we add more sodium to the extracellular fluid, then ENa will II.arrow_forwardIf the percent difference is a positive number, what does this tell us about the movement of water across the membrane?arrow_forward
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