2. Imagine that you just completed an afterimage activity that resulted in Y B- neurons becoming fatigued. Now, you stare at a white background. According to the principles you just learned about color opponency, neurons will now increase its firing rate, and the color that you will see as you look at the white background will be .

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answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

atp is used for energy.