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Which is the correct order of the firing of a neuron?
a.
resting potential, threshold, action potential, refractory period
b.
resting potential, threshold, refractory period, action potential
c.
action potential, resting potential, refractory period, threshold
d.
threshold, resting potential, refractory period, action potential
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- Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. GolgibodiesThe nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward? a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential. b. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell. c. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in. d. The refractory period prevents another action potential by lowering the threshold potential.A stimulus causes a change in permeability of neural membranes, which begins the process of transmitting an impulse. If the stimulus reaches the threshold potential of a neuron, an action potential is generated. Select the numbers of the statements below that occur once the threshold potential is reached. 1. Sodium ions flow into the neuron. 2. Sodium ions flow out of the neuron. 3. The membrane potential becomes positive. 4. The membrane potential becomes negative. 5. Voltage-gated potassium channels open. 6. Voltage-gated potassium channels close. 7. Potassium ions flow into the neuron. 8. Potassium ions flow out of the neuron. Place the numbers in order from the first event to the last event: and
- What is/are true statements about Action Potentials? Select all that apply. Group of answer choices: A. action potentials propagate down axons B. nformation is coded through the frequency of action potentials C. action potentials are slower in myelinated axons D. action potentials vary depending on the strength of the stimulusDuring the action potential, which of the following activity is LIKELY to occur? Select one: a. Na+ channels open at the beginning of the action potential, and Na+ moves into the axon b. Na+ channel passages become smaller and get retracted at the beginning of the action potential c. Na+ channels are less active and static throughout the action potential process d. less Na+ is pumped to the axon when the action potential is triggeredAt maximal stimulation, much above threshold, how long will it be until an axon fires the next AP? A.The absolute refractory period B.The relative refractory period C.The absolute and relative refractory periods
- During a relative refractory period of an action potential A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal E. None of the above are correctWhat event triggers an action potential?a. Opening of sodium channelsb. Opening of delayed potassium channelsc. High concentration of negative ions outside the celld. Activation of the sodium–potassium pump5. Ordinarily, a neuron’s trigger zone is activated banatomy and psychology Choise What guarantees that there are unidirectional action potential? A. threshold B. depolarization refractory period C. absolute refractory period D. relative refractory period
- The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential? A. Na+ channels close in a voltage-dependent manner B. Na+ channels close in a time-dependent manner C. Na+ channels close in a chemically-dependent manner D. Na+ channels open in a voltage-dependent mannerWhere is the action potential generated initiated in the neuron? Select one: a. Nucleus of the neuron. b. Dendritic terminals. c. Post-synaptic gap. d. Axon hillock.On what part of the neuron are NT receptors typically located? If the activated NT receptors cause channels to open or change thus changing the diffusion of ions, what type of potential will this initially produce? A.Resting B.Graded C.Action D.Homeostatic
