Which of the Following Best Describes the Mechanism Behind the Increased

question 10

Multiple Choice

Which of the following best describes the mechanism behind the increased oxygen detected by fMRI during brain activity?

• A) Glial cells aid in increasing capillary blood flow through their interaction with neurons and capillaries during periods of high activation.
• B) There is an increase in the flow of oxygen ions along the axons of active neurons.
• C) Glial cells allow more molecules into the intracellular space during periods of high activation.
• D) Glial cells transport oxygen and other ions/molecules from blood capillaries directly to neurons during periods of high activation.
• E) Oxygen ion channels in glial cells near blood capillaries become more permeable during periods of high activation, allowing more oxygen ions into glial networks.

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Definitions:

Computerised Tomography

A medical imaging technique that uses computer-processed combinations of multiple X-ray measurements taken from different angles to produce cross-sectional images of specific areas of a scanned object, allowing the user to see inside the object without cutting.

Positron Emission Tomography

A nuclear medicine functional imaging technique used to observe metabolic processes in the body as an aid to the diagnosis of disease.

Electrical Stimulation

A therapeutic method or research tool that applies electrical currents through electrodes to stimulate nerves, muscles, or brain areas for various purposes.

Parasympathetic

Pertaining to the part of the autonomic nervous system that conserves energy by slowing the heart rate and relaxing muscles after periods of stress.