________ are glial cells in the CNS that help form the blood-brain barrier.
Fill in the blank(s) with the appropriate word(s).
Astrocytes
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Antibodies often react with the antigens that caused them to form, making the antigens stick together in little clumps, or ________.
A. coagulate B. dissolve C. agglutinate D. contract
What may result if the pharyngoesophageal sphincter does not function properly?
A) Food will cause the esophagus to collapse. B) Food will bypass the esophagus. C) Food will be swallowed much faster. D) Food cannot enter the esophagus.
The indicators that are essential for human life include all of the following EXCEPT ________.
A. coloring B. heart rate C. respirations D. temperature
Drugs that are used to treat depression increase the levels of this neurotransmitter in the brain
A. glutamate B. serotonin C. GABA D. acetylcholine E. dopamine