Positron Emission Tomography (PET)scans Work by

question 51

Multiple Choice

Positron emission tomography (PET) scans work by

• A)measuring the reflection of a narrow X-ray beam as it passes through the brain.
• B)tracing the amount of glucose used in different parts of the brain.
• C)measuring the signals emitted by the brain when placed in a strong magnetic field.
• D)destroying parts of the brain to observe the effects on behavior.
• E)using mild electrical currents to observe the effects of stimulating parts of the brain.

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Definitions:

Activation Gate

In the context of cell membrane channels, this refers to a mechanism that opens or closes ion channels in the cell membrane in response to physiological stimuli.

Transport Pump

Proteins in cell membranes that use energy to move substances across the membrane, often against a concentration gradient.

Saltatory Conduction

The transmission of a neural impulse along a myelinated neuron; ion activity at one node depolarizes the next node along the axon.

Voltage-Activated

Pertains to ion channels in cell membranes that open or close in response to changes in membrane potential.