The plasma membrane of a neuron has voltage-gated sodium and potassium
channels. What is the effect of membrane depolarization on these channels?
A. Membrane depolarization opens sodium channels but closes potassium channels.
B. Membrane depolarization opens sodium and potassium channels at the same time.
C. Membrane depolarization first opens sodium channels and then opens potassium
channels.
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C. Membrane depolarization first opens sodium channels and then opens
potassium channels.
Which of these observations illustrate regional specialization in the human nervous
system?
Select all that apply.
,A. Sensory information may be processed in the occipital lobe or the temporal lobe.
B. When the activity of a synapse fails to correlate with that of other synapses, the
synaptic connection may become weaker.
C. Reading a printed word out loud and then thinking of a related word involves the
visual cortex, Broca’s area, and the frontal and temporal lobes.
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A. Sensory information may be processed in the occipital lobe or the
temporal lobe.
C. Reading a printed word out loud and then thinking of a related word
involves the visual cortex, Broca's area, and the frontal and temporal lobes.
When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so
rapidly in succession that the postsynaptic neuron's membrane potential has not
returned to the resting potential before the second EPSP arrives, the EPSPs add
together, producing:
A. temporal summation
B. spatial summation
C. the refractory state
D. an IPSP
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A. temporal summation
The following steps refer to various stages in transmission at a chemical synapse.
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane.
2. Calcium ions rush into neuron's cytoplasm.
3. An action potential depolarizes the membrane of the presynaptic axon terminal.
4. The ligand-gated ion channels open on the post synaptic membrane.
5. The synaptic vesicles release neurotransmitter into the synaptic cleft.
Which sequence of events is correct?
, A. 1 → 2 → 3 → 4 → 5
B. 2 → 3 → 5 → 4 → 1
C. 3 → 2 → 5 → 1 → 4
D. 4 → 3 → 1 → 2 → 5
E. 5 → 4 → 3 → 2 → 1
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C. 3 → 2 → 5 → 1 → 4
What is not true about the blood-brain barrier?
A. It serves a protective function.
B. It blocks the passage of all materials from the capillaries.
C. It is a trait of capillaries near the brain and not elsewhere in the body.
D. It is formed by a specific type of glial cell fusing around the capillary.
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B. It blocks the passage of all materials from the capillaries.
Individuals who have suffered a brain injury and cannot form any new lasting
memories but can recall events that occurred before their injury have most likely
suffered damage to their:
A. hippocampus
B. medulla
C. cerebellum
D. limbic system
E. pons
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channels. What is the effect of membrane depolarization on these channels?
A. Membrane depolarization opens sodium channels but closes potassium channels.
B. Membrane depolarization opens sodium and potassium channels at the same time.
C. Membrane depolarization first opens sodium channels and then opens potassium
channels.
Give this one a try later!
C. Membrane depolarization first opens sodium channels and then opens
potassium channels.
Which of these observations illustrate regional specialization in the human nervous
system?
Select all that apply.
,A. Sensory information may be processed in the occipital lobe or the temporal lobe.
B. When the activity of a synapse fails to correlate with that of other synapses, the
synaptic connection may become weaker.
C. Reading a printed word out loud and then thinking of a related word involves the
visual cortex, Broca’s area, and the frontal and temporal lobes.
Give this one a try later!
A. Sensory information may be processed in the occipital lobe or the
temporal lobe.
C. Reading a printed word out loud and then thinking of a related word
involves the visual cortex, Broca's area, and the frontal and temporal lobes.
When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so
rapidly in succession that the postsynaptic neuron's membrane potential has not
returned to the resting potential before the second EPSP arrives, the EPSPs add
together, producing:
A. temporal summation
B. spatial summation
C. the refractory state
D. an IPSP
Give this one a try later!
A. temporal summation
The following steps refer to various stages in transmission at a chemical synapse.
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane.
2. Calcium ions rush into neuron's cytoplasm.
3. An action potential depolarizes the membrane of the presynaptic axon terminal.
4. The ligand-gated ion channels open on the post synaptic membrane.
5. The synaptic vesicles release neurotransmitter into the synaptic cleft.
Which sequence of events is correct?
, A. 1 → 2 → 3 → 4 → 5
B. 2 → 3 → 5 → 4 → 1
C. 3 → 2 → 5 → 1 → 4
D. 4 → 3 → 1 → 2 → 5
E. 5 → 4 → 3 → 2 → 1
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C. 3 → 2 → 5 → 1 → 4
What is not true about the blood-brain barrier?
A. It serves a protective function.
B. It blocks the passage of all materials from the capillaries.
C. It is a trait of capillaries near the brain and not elsewhere in the body.
D. It is formed by a specific type of glial cell fusing around the capillary.
Give this one a try later!
B. It blocks the passage of all materials from the capillaries.
Individuals who have suffered a brain injury and cannot form any new lasting
memories but can recall events that occurred before their injury have most likely
suffered damage to their:
A. hippocampus
B. medulla
C. cerebellum
D. limbic system
E. pons
Give this one a try later!
