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WEEK 7 PHYSIOLOGY
Nerve Signaling
| Question | Answer |
|---|---|
| If the threshold potential is surpassed, the full peak of the action potential is always reached False True | True |
| The speed of a nerve impulse depends on the neurons resting potential True FALSE | FALSE |
| The membrane potential, maintained by a nonconducting neurons’s plasma membrane is called ___ membrane potential Resting Polarized Conduction Action | Resting |
| A term commonly used as a synonym for action potential is Depolarization Repolarization Stimulus Nerve impulse | Nerve impulse |
| There are two types of synapses – the electrical synapse, and the ___ synapse Mechanical Chemical Sonic Sensory | Chemical |
| In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier True False | TRUE |
| Which membrane receptors ask to directly change ion permeability when stimulated Gated channel receptor Metabotrophic receptor Ionotropic receptor G protein coupled receptors | Gated channel receptor |
| Weather an impulse in continued through a neuron depends on the magnitude of the voltage in the axon hillock False True | TRUE |
| The difference in electrical charge between the inside and outside of a membrane is called the membrane potential True False | TRUE |
| When a neuron is resting, the inner surface of the plasma membrane is slightly positive compared with its outer surface False True | FALSE |
| Which chemicals allow neurons to communicate with another Glial transmitters Sensory transmitters Neurotransmitters Neurofibrils | Neurotransmitters |
| A neurologist is using the voltmeter to measure potential the membrane potential of a neuron was recorded at +30 MV this is what type of membrane potential Conduction Polarized Resting Action | Action |
| if the magnitude of the local depolarization surpasses a limit called the ___ voltage gated Na+ channels are stimulated to open Local potential Threshold potential Action potential Resting potential | Threshold potential |
| Movement of the membrane potential away from zero below the usual RMP is called Depolarization repolarization hyperpolarization hyperpolarization | hyperpolarization |
| mechanisms produce and maintain resting membrane potential excess of negative ions on the outer Reducedof ions on the outer surface Balanced dist of positive & negative ions b/t outer and inner Slight excess a positive ions on the outer surface | Slight excess a positive ions on the outer surface |
| mechanism quickly terminates action of a neurotransmitter NM once it binds to post synaptic receptor NM molecules transported back to synaptic knob NM molecules metabolized to inactive compounds All NM molecules transported into nearby glial cells | ALL CORRECT |
| In a myelinated fibers, the action potential jumps from one node of Ranvier to the next True False | TRUE |
| An ion channel that opens in response to a sensory stimulus Local potential Stimulus gated channel Ionic channel Sodium potassium channel | Stimulus gated channel |
| The difference between Na and K in the generation of AP Na causes depolarization and K causes repolarization Na causes repolarization and K is not required Na causes repolarization of the cell and K causes depolarization Na causes Unipolarization | Na causes depolarization and K causes repolarization |
| When Neurotransmitters from synaptic knob stimulate a postsynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. This is Tetanus Temporal summation Twitch Spatial summation | Temporal summation |
| Membrane that that exhibit a membrane potential is said to be Bipolarized Polarized Multipolarized Unipolarized | Polarized |
| The sodium potassium pump actively pumps three potassium ions out of the neuron and two sodium ions in False True | FALSE |
| A brief period during which a local area of an accent membrane resists restimulation is called Repolarization Action Resting Refractory | Refractory |
| The tiny bolts at the end of a terminal branch of a presynaptic neurons axon is called Receptor site Telodendria Synaptic cleft Synaptic knob | Synaptic knob |
| In depolarization the membrane potential moves toward zero where is in hyperpolarization the membrane potential moved away from zero False True | TRUE |
| A synapse can only occur between an axon and a Cell body Dendrite Another axon Any of the above | Any of the above |
| The active transport mechanism in the plasma membrane that transport sodium and potassium ions in opposite directions at a different rate is the Chloride channel Sodium potassium channel Ion Pump Sodium potassium pump | Sodium potassium pump |
| The action potential seems to Leap from one note to another note, along a myelinated fibers, this type of impulse which generation is called _____conduction Action potential refractory Saltatory Sensory | Saltatory |
| Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes True False | FALSE |
| The magnitude of the action potential peaks when the sodium channels close False True | TRUE |
| Which of the following is not used by the body as a Nitric oxide Acetylcholine Carbon monoxide All of these are used by the body is Neurotransmitters | All of these are used by the body is Neurotransmitters |
| Which neuron could transmit a nerve impulse the fastest A small diameter in around with out myelin A large diameter neuron without Myelin A large diameter neuron with Myelin A small diameter neuron with Myelin | A large diameter neuron with Myelin |
| Severe depression can be caused by a deficit in certain brain is synapses of Acetylcholine Amines Amino acids Neuropeptides | Amines |
| spatial summation? Simultaneous stimulation of more than one neuron impulses fired rapid succession by same neuron NM released simultaneously from several presynaptic knobs converge 1 postsynaptic neuron Speed of impulse increased NM are released | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron |
| Acetylcholine is the same class of a Neurotransmitters as Serotonin Histamine Dopamine None of the above | None of the above |
| nervous system, coding for the strength of a stimulus: Changes in the magnitude of action potential Changes in the length or duration of the action potential The frequency of nerve impulses An increase in the number of opening sodium channels | The frequency of nerve impulses |
| When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called Repolarization Refraction Saltatory conduction Diffusion | Saltatory conduction |
| True of a neuron with resting potential cell membrane permeable to Na+, impermeable to K+ outer surface of the plasma membrane negative charge highest concentration of K+ is extracellular sodium pump has moved Na+ the outside PM | sodium pump has moved Na+ the outside PM |
| A synapse consists of A synaptic knob a synaptic cleft The plasma membrane of a postsynaptic neuron All of the above | All of the above |
| The only ions that can diffuse across a neurons membrane when the neuron is at rest is Sodium Potassium Proteins Phosphate | Potassium |
| The fastest nerve fibers in the body can conduct impulses up to approximately ___ meters per second 60 85 130 190 | 130 |
| A slight shift away from the resting membrane Potential in a specific region of the plasma membrane is called a ___ potential Membrane Resting membrane Local None of the above | Local |
| Which of the following anti-depressants act by blocking the action of monoamine oxidase MAO Phenelzine Imipramine Amitiriptline Cocaine | Phenelzine |
| The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body Almost 50 times faster Almost 100 times faster Almost 300 times faster Almost 500 times faster | Almost 300 times faster |
| Stimulus gated channels open in response to Sensory stimuli The influx of potassium Hyper polarization Both a and b | Sensory stimuli |
| First event when an adequate stimulus is applied to a neuron The membrane potential move immediately to value of +30 MV The potassium channels open The sodium channels are inactivated Some of the sodium channels at the point of stimulation open | Some of the sodium channels at the point of stimulation open |
| true of an action potential The plasma membrane is impermeable to NA+ and K+ ions Na+ ions move extracellularly Charge become equal on the outside and inside Outside of the plasma membrane is negatively charged and the inside is positively charged | Outside of the plasma membrane is negatively charged and the inside is positively charged |
| The neurotransmitter that inhibits the conduction of pain impulses are Acetylcholine Enkephalins Dopamine Norepinephrine | Enkephalins |
| Serotonin is an example of an Amino acid neurotransmitter Amine neurotransmitter Acetylcholine derivative Neuropeptide neurotransmitter | Amine neurotransmitter |
| For neurotransmitter to produce inhibitory postsynaptic potential, which of the following channels must open Sodium and potassium channels Potassium and or chloride channels Sodium and chloride channels Only the sodium channels | Sodium and chloride channels |
| When an impulse reaches a synapse To nerve fibers come in direct contact Impulses will pass in either direction In electrical spark will jump the gap Chemical transmitters are released | Chemical transmitters are released |
| amino acid as neurotransmitters is incorrect Most common neurotransmitters in the CNS All inhibitory neurotransmitters Glycine widely distributed inhibitory neurotransmitter in spinal cord All of the above are correct | All inhibitory neurotransmitters |
| Compared with the outside of an ion the inside has a Positive Negative Equal None of the | Negative |
| Which of the following is not one of the main chemical classes of Neurotransmitters Triglycerides Amines Amino acids Neuropeptides | Triglycerides |
| Dopamine, Epinephrine , and norepinephrine are classified as Acetylcholine Neuropeptides Catecholamines None of the above | Catecholamines |
| During a relative refractory. Period. The action potential cannot be initiated A resting potential exists The cell membrane is impermeable to Na+ and K+ The action potential can be initiated with a strong stimulus | The action potential can be initiated with a strong stimulus |
| No impulse can be sent through a neuron During the relative refractory Period. When the charge of the neuron is – 70 During the absolute refractory Period. When the stimulus is too strong | During the absolute refractory. Period. |
| Excitatory neurotransmitters are most likely to Increase the speed of impulse conduction Make the cell membrane impermeable Initiate an action potential make the resting potential more negative | Initiate an action potential |
| A synaptic knob it would be located on Cell body Axon Dendrite Cell body, axon or dendrite | Axon |
| Neurotransmitters are released in a synapse in bind to Presynaptic terminal Synaptic cleft Base of the axon Receptors on the postsynaptic neuron | Receptors on the postsynaptic neuron |
Created by:
sabrinaseher