The Presence of a Barrier Between the Bloodstream and the Brain

question 108

Multiple Choice

The presence of a barrier between the bloodstream and the brain is suggested by the observation that

• A) all cells of the body are stained by a dye injected into the bloodstream.
• B) injection of dye into the bloodstream stains all cells but those of the brain and spinal cord.
• C) the gut is stained by a dye injected into the brain ventricles.
• D) injection of dye into the spinal cord stains the cells of the gut.
• E) injection of dye into the gut stains the cells of the spinal cord.

---

Definitions:

New York Mets

A professional baseball team based in New York City, part of the National League division of Major League Baseball.

Firm

A business organization, such as a corporation, partnership, or sole proprietorship, that sells goods or services for profit.

Factor Market

The marketplace where services of the factors of production (notably land, labor, capital) are bought and sold.

Resources Exchanged

The process through which different types of resources, including goods, services, information, and money, are traded or swapped among individuals, businesses, or countries.