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week 7 physi

physiology chapter 7

QuestionAnswer
The difference in electrical charge between the inside and outside of a membrane is called the membrane potential. True or False True
The speed of a nerve impulse depends on the neuron’s resting potential. True or False False
A synapse can occur only between an axon and: a dendrite. a cell body. another axon. Correct Answer any of the above.
Which chemicals allow neurons to communicate with one another? neurotransmitters
Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. True or False True
In a myelinated fiber, the action potential jumps from one node of Ranvier to the next. True or False True
The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the sodium-potassium pump.
If the magnitude of the local depolarization surpasses a limit called the _____, voltage-gated Na+ channels are stimulated to open. threshold potential
A term commonly used as a synonym for action potential is nerve impulse.
An ion channel that opens in response to a sensory stimulus is a(n) stimulus-gated channel.
In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. True or False True
When neurotransmitters from synaptic knobs stimulate a postsynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. This is called temporal summation.
A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30 mV. This is what type of membrane potential? Action
The action potential seems to “leap” from node to node along a myelinated fiber. This type of impulse regeneration is called __________ conduction. saltatory
The brief period during which a local area of an axon's membrane resists re-stimulation is called the __________ period. refractory
Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes. True or False False
The sodium-potassium pump actively pumps three potassium ions out of the neuron and two sodium ions into the neuron. True or False False
A membrane that exhibits a membrane potential is said to be polarized
What mechanism quickly terminates the action of a neurotransmitter once it binds to its postsynaptic receptor? Neurotransmitter molecules are transported into nearby glial cells, neurotransmitter molecules are metabolized into inactive compounds, neurotransmitter molecules are transported back into the synaptic knobs ( All of the above are correct )
The membrane potential maintained by a nonconducting neuron’s plasma membrane is called the _____ membrane potential. resting
Movement of the membrane potential away from zero (below the usual RMP) is called hyperpolarization.
There are two types of synapses—the electrical synapse and the __________ synapse. chemical
The mechanisms that produce and maintain the resting membrane potential do so by producing a slight excess of positive ions on the outer surface of the plasma membrane.
The tiny bulge at the end of a terminal branch of a presynaptic neuron’s axon is called a(n) synaptic knob.
In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero. True or False True
The magnitude of the action potential peaks when the sodium channels close. True or False True
Which membrane receptor acts to directly change ion permeability when stimulated? Gated-channel receptor
The difference between sodium and potassium in the generation of action potential is that: sodium causes depolarization of the cell membrane, and potassium causes repolarization of the cell membrane.
When a neuron is resting, the inner surface of its plasma membrane is slightly positive compared with its outer surface. True or False False
If the threshold potential is surpassed, the full peak of the action potential is always reached. True or False True
Created by: BerettaBreeze
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