The Major Disadvantage of a Blood-Brain Barrier Is That ____

question 120

Multiple Choice

 The major disadvantage of a blood-brain barrier is that ____.

• A) many chemicals can easily diffuse into the brain
• B) so much glucose is required to maintain it
• C) certain required chemicals must be actively transported
• D) viruses cannot escape

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Definitions:

Parenchyma

A type of living plant tissue consisting of relatively unspecialized cells with thin cell walls that function in photosynthesis, storage, and as the site of many metabolic processes.

Tracheids

Tracheids are elongated cells in the xylem of vascular plants that serve in transport and structural support, facilitating the flow of water.

Xylem

The vascular tissue in plants that conducts water and dissolved nutrients from the roots to the rest of the plant and provides structural support.

Collenchyma

A type of plant tissue known for its flexible and elastic properties, providing structural support mainly in areas of growth.