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During an action potential, voltage gated K channels open after voltage gated Na channels. What effect does this have on the membrane potential?
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A change in membrane potential insufficient to cause an action potential is known as a __ __.
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Phys Ch. 12
| Question | Answer |
|---|---|
| During an action potential, voltage gated K channels open after voltage gated Na channels. What effect does this have on the membrane potential? | It becomes less positive and more negative |
| A change in membrane potential insufficient to cause an action potential is known as a __ __. | subthreshold value |
| What must happen in order for a chemical signal to change the membrane potential of a neuron (2)? | there must be a change in the number of open ion channels and in ion flow across the membrane |
| The main activity of __ is nerve impulse conduction. | axons |
| Rank the conduction velocity of the groups of nerve fibers from fastest to slowest: A. type A fibers B. type C fibers C. type B fibers | A. type A fibers, C. type B fibers, B type C fibers |
| The regulation of the response of neurons to neurotransmitters is known as __. | neuromodulation |
| The opposition to the movement of electrical charge is known as __. | resistance |
| The "E" in EPSP stands for __, meaning that the potential makes the inside of the postsynaptic cell more __. | excitatory, positive |
| A flow of electrical current called a(n) __ __ is generated within the initial segment of a neuron. | action potential |
| A positive change in the membrane potential is called __. | depolarization |
| During the __ __ an axon is either incapable of generating an action potential, or requires a larger than normal stimulus | refractory period |
| Which electrical event immediately follows the binding of neurotransmitter molecules to chemically gated ion channels? | postynaptic potential |
| The all or none law refers to the fact that action potentials will only occur if the initial segment reaches __. | threshold |
| If several EPSPs occur at different synapses, they undergo __ __ at the initial segment. | spatial summation |
| The relative difference in charge across the plasma membrane of a resting neuron is known as the __ __ __. | resting membrane potential |
| Flow of which ion is the most common cause of repolarization? | K |
| A nerve impulse that "jumps" from node to node is called __ conduction. | saltatory |
| Acetylcholinesterase removes acetylcholine from the synaptic cleft via __. | hydrolysis |
| Which type of axon requires more ATP to function? A. myelinated axon B. unmyelinated axon | B. unmyelinated axon |
| Neuronal pools are made of: A. motor neurons B. interneurons C. sensory neurons | B. interneurons |
| Creating and transmitting __ currents is central to the function or neuron physiology. | electrical |
| The chemical concentration gradients of Na and K are maintained by the __ __. | Na/K pump |
| The presence of a __ sheath increases the rate of impulse conduction. | myelin |
| Graded potentials that occur in postsynaptic neurons are specifically called postsynaptic __. On the distal side of a synaptic cleft. | potentials |
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khinson