- This Worksheet Will Help You Understand Membrane Potential By Utilizing The Ions That Play A Big Part In Determining It 1 (67.01 KiB) Viewed 259 times
- This Worksheet Will Help You Understand Membrane Potential By Utilizing The Ions That Play A Big Part In Determining It 2 (215.21 KiB) Viewed 259 times
- This Worksheet Will Help You Understand Membrane Potential By Utilizing The Ions That Play A Big Part In Determining It 3 (196.56 KiB) Viewed 259 times
This worksheet will help you understand membrane potential by utilizing the ions that play a big part in determining it. Although we'll be focused on neurons, keep in mind that all cells have a membrane potential. The ions we care about are shown in the basic MODEL of a cell membrane below-there are ions next to the plasma membrane (small squares), but the cell also contains greater stockpiles of these ions within and outside the cell. NE NA Mat OUT IN
1. What is the cell's membrane potential (mv)? Explain. Let's concentrate on the K+ ions and the always-open K+ leak channels. MULL K+ LLLLLL W K+ MIT K+ K+ K+ K+ Leak channels What happens now ?? K+ K+ K+ K+ K+ K+ K+ K+ IN 16 1. Which of the following images best depicts what will occur? Will only a tiny amount of K+ migrate to the outside, or will a huge amount of K+ move? Explain your response in terms of both the chemical/concentration gradient and the electrical gradient of K+.
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Let's look at both Na+ and K+ ions now. Na+ leak channels exist, however they are uncommon in compared to K+ channels. OUT Nat Nar Na+ Na Na+ Na Na Nat www 1. Which of the following images best represents a neuron's resting potential? Explain your response. OUT OUT A B BOE-
N OUT No I' C IN 25 1. Write the letters in the diagram below to indicate the stages of the action potential.
C Membrane potential (mV) B A A 70- E 2 3 Time (msec) 1. Which of the following parts of the diagram matches to: A period during which voltage-gated sodium channels are deactivated and subsequently reactivated. Potassium channels are still open. B. The closure of voltage-gated sodium and potassium channels. C. The point at which voltage-gated sodium channels start to close and voltage-gated potassium channels start to open. D. A period during which certain voltage-gated potassium channels stay open, allowing potassium to leave the cell. E. A period during which voltage-gated sodium channels open rapidly, allowing sodium to enter the cell.