Which of the Following Best Describes the Mechanism Behind the Increased

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.