Rate the Effectiveness of the Following Barriers at Preventing Substances

question 61

Short Answer

Rate the effectiveness of the following barriers at preventing substances from crossing as either VERY permissive or NOT permissive:
_____ the arachnoid barrier, where CSF drains into the venous return (in the direction of CSF to circulation)
_____ the arachnoid barrier, where CSF drains into the venous return (in the direction of circulation to CSF)
_____ the blood-CSF barrier composed of choroid epithelial cells
_____ the blood-brain barrier composed of endothelial cells
_____ the endothelial cells surrounding vasculature that supplies blood to the circumventricular organs

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Definitions:

Xylose

A sugar extracted from wood or straw and used as a dietary supplement or in the production of materials such as xylitol.

Chains

Sequences of items or elements linked or connected together, often found in polymers, proteins, or chemical compounds.

Cell Differentiation

Cell differentiation is the process by which cells become specialized in structure and function to perform specific tasks within an organism.

Specific Functions

Distinct roles or activities that are characteristic of a particular process, organ, or system within a living organism.