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- A cell has a membrane potential of -100 mV (more negative inside than outside) and has 1,000 times more calcium ions outside the cell than inside. Which best describes a mechanism by which Ca2+ enters this cell? facilitated diffusion of Ca2+ into the cell down its electrochemical gradient movement of Ca2+ into the cell through an ion channel down its concentration gradient passive diffusion of Ca2+ into the cell down its electrochemical gradient cotransport of Ca2+ into the cell with Cl- movement of Ca2+ into the cell through a carrier protein down its electrical gradient I know that the answer is 1 but please explain why. Thank you.The resting membrane potential is established by? The Na+/K+-ATPase pumping Na+ into the cell and K+ out of the cell The Na+/K+-ATPase pumping K+ into the cell and Na+ out of the cell A larger diffusion of K+ out of the cell compared to diffusion of Na+ into the cell A larger diffusion of K+ into the cell compared to diffusion of Na+ out of the cell a) and d) b) and c)The electrochemical gradient across the plasma membraneGroup of answer choices is caused by more sodium on the inside of the cell relative to the outside of the cell Contains stored potential energy that can be harvested by the cell is caused solely by the sodium/potassium ATPase is a form of kinetic energy that can be harvested by the cell All of the above
- Dane is doing an experiment by using a dialyzing membrane as a model for cell membrane to observe the movement of the substances like glucose in before and after fluids using benedict's test. BEFORE: Fluid in the beaker blue (absence of glucose) Fluid in the bag orange (presence of glucose) AFTER Fluid in the beaker orange (presence of glucose) Fluid in the bag orange (presence of glucose) Was there a movement of glucose across the artificial membrane? Why or why not?Which of the following regarding microtubules is LEAST correct? A)Microtubules do not have important functions in neurons B)Microtubules are important for anterograde axoplasmic transport C)No answer text provided. D)Microtubules are important for maintaining the structure of the neuron E)Microtubules are important for retrograde axoplasmic transportWhich of the following regarding the sodium potassium pump is FALSE? It tends to be found on the apical plasma membrane of polarized cells It transports three sodium ions to the outside of the cell It transports two potassium ions to the inside of the cell. It helps to maintain unequal distribution of ions across the plasma membrane
- What are the relative concentrations, inside and outside, of Na+ and K+ in typical (alive) eukaryotic cells? Both are lower outside the cell relative to inside. K+ is higher outside while K+ is higher inside. Na+ is higher outside while K+ is higher inside. They are at equilibrium inside relative to outside.Draw a simple cell; indicate where the concentrations of Na1, K1, and Cl2 are high and low and the electrical potential difference across the membrane when the cell is at rest.Which of the following would not be able to pass through the plasma membrane without the help of transmembrane proteins. K+ O2 anything with a charge or is polar Two answer choices are correct.
- https://www.youtube.com/watch?v=_bPFKDdWlCg&feature=youtu.be – Na/K pump Answer the following question: How does the movement of three positive Na ions out of the cell and two positive K ions into the cell make the inside of the cell negative?When the membrane is at rest, what are the forces acting on sodium ions?A. Both the concentration gradient and the electrical gradient tend to move sodium ions into the cell.B. Both the concentration gradient and the electrical gradient tend to move sodium ions out of the cell.C. The concentration gradient tends to move sodium ions into the cell, and the electrical gradient tends to move them out of the cell.D. The concentration gradient tends to move sodium ions out of the cell, and the electrical gradient tends to move them into the cell.The membrane of most cells, including neurons, contains passive, open, K' leak channels. Given the normal K' concentrations and the resultant concentration gradient, which direction would K' be expected to move (diffuse) through these leak channels? Select one: 1/into the cell 2/out of the cell