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Exam 11: Functional Organization of Nervous Tissue

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Question 41

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-The figure is a process figure of the chemical synapse.What does "A" represent?

A) postsynaptic membrane
B) synaptic cleft
C) synaptic vesicle
D) voltage-gated calcium channel
E) presynaptic terminal

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Question 42

Multiple Choice

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The opening of more and more Na+ ion channels during depolarization

A) is the result of the sodium-potassium exchange pump.
B) is an example of a positive feedback cycle.
C) is possible only if K+ channels remain closed.
D) is the cause of the afterpotential.
E) is an example of a negative feedback cycle.

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Question 43

Multiple Choice

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The plasma membrane of a neuron is more permeable to potassium ions because

Match the following concerning concentration differences across the plasma membrane. -large molecules trapped inside cell

Neurons in the skin that are responsible for detecting pain are

Gaps or interruptions in the myelin sheath are called

The absolute refractory period ends when

Arrange the events of synaptic transmission in correct sequence. (1) sodium ions diffuse into the cell and cause a local potential (2) neurotransmitter binds with receptor on postsynaptic cell (3) neurotransmitter diffuses across the synaptic cleft (4) membrane permeability to sodium ions on postsynaptic cell increases (5) action potential causes release of neurotransmitter

Mr.Miller has been hospitalized for the flu.The flu virus increases membrane permeability to potassium.You would expect his cells to

-The figure is a process figure of the chemical synapse.What does "B" represent?

Match the following concerning concentration differences across the plasma membrane. -requires ATP

A neuromodulator

-Identify structure "B" on the neuron.

Clusters of gray matter deep within the brain are called

Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?

Neurons that have a single axon and a single dendrite are

If the charge difference across the plasma membrane is decreased,

Cell bodies of the peripheral nervous system are located in

-The figure illustrates the Action Potential.What does "A" represent?

The same neurotransmitter binds to a postsynaptic cell but produces a variety of different effects.What does this mean?