Choose the correct(s) regarding membrane potential. Select all that apply: 1. Graded potentials can be summed. 2. At rest, the neuronal membrane is more permeable to Na+. 3. Graded potentials can result in hyperpolarization or depolarization. 4. Action potentials only occur in excitable membranes. 5. Action potentials are decremental. 6. Action potentials are mediated via ligand-gated Na+ channels. 7. An action potential can only begin once the threshold is reached.
Added by Cheryl R.
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Graded potentials can be summed: This is true. Graded potentials can summate, either through spatial or temporal summation. Show more…
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Membrane Potentials Using the terms provided, complete the following statements: 1. The outside of most cell membranes is negatively charged compared to the inside. 2. This charge difference across the membrane of an unstimulated cell is called the resting-membrane-potential. 3. When a muscle or nerve cell is stimulated, sodium ions rush into the cell, causing the inside of the cell membrane to be positively charged compared to the outside. 4. This brief reversal of charge across the cell membrane is called the action potential.
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