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14 how does chemical disequilibrium in the body give

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14. How does chemical disequilibrium in the body give rise to electrical disequilibrium?15. All living cells have resting membrane potentials.True or False?16. To which ion is the resting cell membrane most permeable? Na+or K+______Therefore, ______ is the major ion contributing to resting cell membrane potential.17. A sudden (increase/decrease?) in Na+permeability allows Na+to (leave/enter?) the cell. When Na+moves, it is moving (down/against?) its concentration gradient and (down/against?) its electrical gradient.The (influx/efflux?) of Na+ions (hyperpolarizes/depolarizes/repolarizes?) the membrane potential,creating an electrical signal. Circle your responses18. Draw arrows with labels to signify depolarization, repolarization, and hyperpolarization on the figurebelow: (From the lecture)19. How do cells alter their permeability to ions?20. List four ions that move through membrane channels:21. Mechanically gated ion channels open in response to:_____________________________________22. Chemically gated ion channels open in response to:_____________________________________23. Voltage-gated ion channels open in response to:_____________________________________0 mV-70 mV
HW5 Fa 21324. Define the electrochemical gradient and explain how it is established.25. Define and describe the resting membrane potential.26. What happens to the membrane potential (starting from -70mV) under the following conditions:Usethe terms hyperpolarize, depolarize, repolarize, no changea. additional K+ channels open without a prior depolarizing event_____________________________b. more Na+ channels open_____________________________c. Cl- channels open_____________________________d. K+ channels close_____________________________e. Na+ channels close without a depolarizing event_____________________________f. K+ channels open after a depolarizing event_____________________________g.increased levels of K+ outside the cells_____________________________h. decreased levels of K+ outside the cells_____________________________i. blocked Na+ channels_____________________________j. increased levels of Na+ outside the cells_____________________________k. inhibition of the Na+/K+ pumps_____________________________l. blocked K+ leak channels_____________________________m. high protein in the ISF _____________________Multiple choice questions:Multiple choice questions.

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Term
Spring
Professor
Pentek
Tags
Osmosis, Ion channel

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