![Campbell Biology in Focus (2nd Edition)](https://www.bartleby.com/isbn_cover_images/9780321962751/9780321962751_largeCoverImage.gif)
Concept explainers
What happens when a resting neuron's membrane depolarizes?
- A. There is a net diffusion of Na+ out of the cell.
- B. The equilibrium potential for K+ (EK) becomes more positive.
- C. The neuron’s membrane voltage becomes more positive.
- D. The cell’s inside is more negative than the outside.
![Check Mark](/static/check-mark.png)
Introduction:
In neuronal signaling, the ions have an important role. Like rest of the cells, the ions are also unequally distributed in the neurons. They are distributed unequally between the surrounding fluid and the cells interior region. Thus, membrane potential means the difference in voltage or charge across a plasma membrane. In case of the resting nerve; the one that does not send signals, the membrane potential is known as the resting potential.
Answer to Problem 1TYU
Correct answer:
When the resting neuron’s membrane depolarizes, the voltage of the neuron’s membrane becomes more positive. Therefore, option (C) is correct.
Explanation of Solution
Reason for the correct statement:
Na+ (sodium) and K+ (potassium) ions are very important for forming the resting potential. When depolarization occurs, there is inflow of Na+, which makes the interior more positive.
Option (C) is given as “The neuron’s membrane voltage becomes more positive”.
“When the resting neuron’s membrane depolarizes, the voltage of the neuron’s membrane becomes more positive”, it is the right answer.
Hence, option (C) is correct.
Reasons for the incorrect statements:
Option (A) is given as “There is a net diffusion of Na+ out of the cell”.
During depolarization, the sodium ions move in the cells not outside the cells. So, it is a wrong answer.
Option (B) is given as “The equilibrium potential for K+ (Ek) becomes more positive”.
During depolarization, the equilibrium potential for K+ is negative. So, it is a wrong answer.
Option (D) is given as “The cell’s inside is more negative than the outside”.
During depolarization, the cells interior is more positive. So, it is a wrong answer.
Hence, options (A), (B), and (D) are incorrect.
When the resting neuron’s membrane depolarizes, the voltage of the neuron’s membrane becomes more positive.
Want to see more full solutions like this?
Chapter 37 Solutions
Campbell Biology in Focus (2nd Edition)
Additional Science Textbook Solutions
HUMAN ANATOMY
Physical Science
Genetics: From Genes to Genomes
Microbiology Fundamentals: A Clinical Approach
Human Physiology: An Integrated Approach (8th Edition)
- What type of structure(s) would you expect to see in peripheral membrane proteins? (mark all that apply) A. Amphipathic alpha helix (one side is hydrophilic and one side is hydrophobic) B. A hydrophobic beta barrel C. A hydrophobic alpha helix D. A chemical group attached to the protein that can anchor it to the membranearrow_forwardTemporal flexibility (the ability to change over time) of actin structures within a cell is maintained by… A. The growth/shrinkage cycle B. Periodic catastrophe C. GTP hydrolysis D. Treadmilling E. None of the abovearrow_forwardDuring in vitro polymerization of actin and microtubule filaments from their subunits, what causes the initial delay in filament growth? A.Nucleation B.Reaching homeostasis C.Nucleotide exchange D.ATP or GTP hydrolysis E.Treadmillingarrow_forward
- You expect to find which of the following in the Microtubule Organizing Center (MTOC)...(mark all that apply) A. Gamma tubulin B. XMAP215 C. Centrioles D. Kinesin-13arrow_forwardThe actin-nucleating protein formin has flexible “arms” containing binding sites that help recruit subunits in order to enhance microfilament polymerization. What protein binds these sites? A.Thymosin B.Profilin C.Cofilin D.Actin E.Tropomodulinarrow_forwardWhile investigating an unidentified motor protein, you discover that it has two heads that bind to actin. Based on this information, you could confidently determine that it is NOT... (mark all that apply) A. A myosin I motor B. A dynein motor C. A myosin VI motor D. A kinesin motorarrow_forward
- You isolate the plasma membrane of cells and find that . . . A. it contains regions with different lipid compositions B. it has different lipid types on the outer and cytosolic leaflets of the membrane C. neither are possible D. A and B both occurarrow_forwardYou are studying the mobility of a transmembrane protein that contains extracellular domains, one transmembrane domain, and a large cytosolic domain. Under normal conditions, this protein is confined to a particular region of the membrane due to the cortical actin cytoskeletal network. Which of the following changes is most likely to increase mobility of this protein beyond the normal restricted region of the membrane? A. Increased temperature B. Protease cleavage of the extracellular domain of the protein C. Binding to a free-floating extracellular ligand, such as a hormone D. Protease cleavage of the cytosolic domain of the protein E. Aggregation of the protein with other transmembrane proteinsarrow_forwardTopic: Benthic invertebrates as an indicator species for climate change, mapping changes in ecosystems (Historical Analysis & GIS) What objects or events has the team chosen to analyze? How does your team wish to delineate the domain or scale in which these objects or events operate? How does that limited domain facilitate a more feasible research project? What is your understanding of their relationships to other objects and events? Are you excluding other things from consideration which may influence the phenomena you seek to understand? Examples of such exclusions might include certain air-born pollutants; a general class of water bodies near Ottawa, or measurements recorded at other months of the year; interview participants from other organizations that are involved in the development of your central topic or issue. In what ways do your research questions follow as the most appropriate and/or most practical questions (given the circumstances) to pursue to better understand…arrow_forward
- The Esp gene encodes a protein that alters the structure of the insulin receptor on osteoblasts and interferes with the binding of insulin to the receptor. A researcher created a group of osteoblasts with an Esp mutation that prevented the production of a functional Esp product (mutant). The researcher then exposed the mutant strain and a normal strain that expresses Esp to glucose and compared the levels of insulin in the blood near the osteoblasts (Figure 2). Which of the following claims is most consistent with the data shown in Figure 2 ? A Esp expression is necessary to prevent the overproduction of insulin. B Esp protein does not regulate blood-sarrow_forwardPredict the per capita rate of change (r) for a population of ruil trees in the presence of the novel symbiont when the soil moisture is 29%. The formula I am given is y= -0.00012x^2 + 0.0088x -0.1372. Do I use this formula and plug in 29 for each x variable?arrow_forwardPlease answer the following chart so I can understand how to do it.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781285866932/9781285866932_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305967359/9781305967359_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781947172517/9781947172517_coverImage_Textbooks.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781938168116/9781938168116_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305389892/9781305389892_smallCoverImage.gif)