e time, large quantities the right, creating the conditil el of Figure 1 9B, J b
ID: 3504930 • Letter: E
Question
e time, large quantities the right, creating the conditil el of Figure 1 9B, J bich a con of the ions has the electrical What effect doe ifference nov e electrice at effect does this change have on the likelihood of an action potential occurring (1 pt.)? When he 25. Look back at the table in question 17. List two ways you could manipulate a cell (by changing ion concentration or permeability) to make the inside of the cell more negative (hyperpolarized) (1 pts.). 6. List two ways you could manipulate a cell to make the inside more positive (depolarized) (2 pts.) 27. A cell is found to have a membrane potential of -90 mV instead of the usual -70 mV. What is the most likely explanation for this observation (I pt.)? A. The concentration of Na outside the cell has increased B. The permeability to K-has increased The concentration of Cl outside the cell has decreased The permeability to Nat has increased 28. A drug that blocks potassium leakage channels would (1 pt.) A. Depolarize the cell B. Hyperpolarize the cell C. Elicit an action potential D. Have no effect on membrane potential 29. Ubiquinone, an electron acceptor in the electron transport chain (oxidative phosphorylation), is found which of the following (1 pt.)? Inner mitochondrial membrane Mitochondrial matrix C. Outer mitochondrial membrane D. NucleusExplanation / Answer
25.
Hyperpolarization occurs when the sodium channels remains closed and potassium channels open. K+ moves out of the cells makes the cell more negative inside.
And one more reason following a depolarization the repolarization and hyperpolarization follows to get ready for another action potential.
The two ways to manipulate a cell to become more negative are
-Make the current status of cell upto - 80mV
-Initiating the membrane potential to reach the level of action potential. Lowering resting potential also leads to hyperpolarization
26.
Depolarization occur when rapid raise of the potential of the interior of cell from the resting stage to the -70mV and it may raise upto +30mV.
Here the sodium channels opened its permeability increases.
-Rushing the sodium into the cell (sodium influx)
-Reducing the membrane potential
27.
B.permeability to K+ increased.
Membrane potential -90mV instead of -70mV indicates the hyperpolarization state. In this state the K+ channels are opened and it is more permeable for K+ ( K+ efflux occurs).
28.
C.Elicit an action potential.
Blockage of poatssium channel prevent the repolarization of cell and increases the action potential and the effective refractory period.
29.
A.Inner mitochondrial membrane.
Ubiquinone is also known as Coenzyme Q10 which is lipid soluble antioxidant in the inner mitochondrial membrane functions as electron carrier and oxidative phosphorylation.
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