What effect will positive ions entering the cell have on the membrane potential? 1 The cell will hyperpolarize 2 The inside of the cell will be less negative than at rest 3 The cell will repolarize 4 The inside of the cell will be more negative than at rest
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What effect will positive ions entering the cell have on the membrane potential?
| 1 |
The cell will hyperpolarize |
|
| 2 |
The inside of the cell will be less negative than at rest |
|
| 3 |
The cell will repolarize |
|
| 4 |
The inside of the cell will be more negative than at rest |
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- In a resting cell, the membrane potential is between -70 and -90 mV. This occurs because ... Group of answer options ... proteins diffuse out of the cell ... 1.sodium ions diffuse out of the cell ... 2.potassium ions diffuse out of the cell ... 3.there are extra sodium ions outside and extra chloride ions inside themembrane ... 4there are fewer calcium ions inside the cell compared to outside which makes the inside more negativeIf sodium permeability were to increase compared to normal what would be the resulting effect on the membrane potential 1.The charge on the inside of the cell becomes less negative compared to resting conditions and hyperpolarizes 2.The charge on the inside of the cell becomes more negative compared to resting conditions and hyperpolarizes 3.The charge on the inside of the cell becomes less negative compared to resting conditions and depolarizes 4.The charge on the inside of the cell becomes more negative compared to resting conditions and depolarizesWhich 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
- Chloride ions (Cl-) are in higher concentration outside of the cell compared to the intracellular fluid (ICF). If a cell is at rest and chloride-specific ion channels open, identify what would happen. Choose ALL of the correct answers. 1 Some chloride will enter the cell, but the concentration gradient for chloride will not change much. 2 The membrane will hyperpolarize 3 Chloride will come into the cell until it reaches chemical equilibrium. 4 The membrane potential won't change. 5 The membrane will depolarize 6 Some chloride will leave the cell, but the concentration gradient for chloride will not change muchA cell biologist is performing an experiment using the voltage clamp method in which they are allowed to change the voltage in the membrane potential. They are wanting to record potassium currents and notice that for a certain membrane potential range, the voltage clamp highlights that there is an inward current of potassium. Would these readings make sense?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
- Why is the resting membrane potential negative? Shouldn't it be positive as cells move in and out positive ionsCell swelling will most directly affect which type of channel protein? Group of answer choices Mechanically gated ion channel Ligand-gated ion channel Ligand-gated ion channel with intracellular ligand binding site Voltage-gated ion channelWhich of the following takes place during an action potential? Na+ ions exit the cell causing depolarization Repolarization occurs when K+ ions enter the cell The membrane becomes more negative during depolarization K+ ions start the action potentials Na+ enters the cell making the membrane potential positive.
- Which of the following mechanism will be activated if there is a shortage of cellular and endoplasmic reticulum Ca2+ reserve? O DAG will activate protein kinase C to release calcium bound to calmodulin ER membrane protein STIM1 will activate plasma membrane Orail channel All of the other mechanisms will be activated IP3 signaling will release stored calcium from the ER DAG will activate protein kinase C to activate store operated calcium channel in the plasma membrane < Previous Next ▸1.A poison causes a drastic rise inE value with stimulation of the membrane.Thereafter membrane is slow to return towards resting membrane potential and levels off several millivolts above the threshold potential. This poison has likely affect which feature of the membrane? a) voltage gated na+ channels. b) voltage gated K+ channels. c) Na+/K+ Atp pump 2. All cell membrane demonstrate action potential if stimulated enough? True/False. 3. how many peaks are there in a compound action potential? a)2. b)4 c)6 d)8 4. Increasing the ionic concentration in the salt bridge results in E value increase to a point after which it plateeus. This is evidence brownian movement at work in the ionic solution that is keeping from energy flowing through the bridge with the fidelity that is seen in the metal bridge? True/ False 5. All cell membrane demonstrate action potential if stimulated enough? True or False.8) The diffusion of K+ out of the cell makes the inside of the cell less positive, or more negative, and acts to restore the original resting membrane potential. This process is called: a) depolarization b) hyperpolarization c) repolarization
