Graded potentials may... (Select all the correct answers!) Group of answer choices make a neuron less likely to fire an action potential. be summed with other graded potentials. travel in neurons by saltatory conduction. hyperpolarize the membrane. depolarize the membrane to the threshold voltage. initiate an action potential.
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Graded potentials: (list all correct answers) (A) always result in triggering an action potential, (B) sum temporally, (C) sum spatially, (D) result from open voltage-gated channels, (E) vary in magnitude. To hyperpolarize the dendritic membrane of a neuron you must open: (A) a cation channel, (B) a calcium channel, (C) a potassium channel, (D) a chloride channel, (E) C or D. Once the axon hillock reaches the threshold potential: (A) the neuron fires, (B) the neuron's action potentials begin, (C) nearby voltage gated sodium channels start to open, (D) nearby voltage gated potassium channels start to open, (E) all of the above occur when an axon hillock receives a threshold potential. An action potential generated in an excitable membrane: (A) decreases in magnitude as it moves down the membrane, (B) generates a local current that depolarizes adjacent membrane to threshold potential, (C) varies in magnitude depending on the initial strength of the stimulus, (D) A & B, (E) B & C.
Adi S.
An excitatory graded potential can form an action potential if: - Graded potentials can never end up forming action potentials - It was propagated at the cell body instead of the dendrites - It summates with other excitatory action potentials - It was formed with voltage gated ion channels - It reaches at least -65 mV on its own
Which of the following statement(s) are true with respect to graded potentials? Select all of the correct answers. Graded potentials can summate in space and time. An action potential is required to generate a graded potential. Graded potential amplitudes decay over distances. Graded potential amplitude increases with stimulus strength. Graded potentials are not regenerative. A graded potential has a threshold.
Sana R.
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