Astrocytes and tight junctions create a barrier to viruses and bacteria known as:

A) choroid plexuses. B) meninges.
C) dural sinuses. D) the blood-brain barrier.


Answer: D

Anatomy & Physiology

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Before B cells secrete antibodies, they differentiate into ________

A) macrophages B) T cells C) antigen-presenting cells D) plasma cells E) stem cells

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A neuron that is more negatively charged than it is at rest is ________.

A. polarized B. hyperpolarized C. depolarized D. refractory

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The sella turcica is part of the ________ bone and houses the ________ gland

A) ethmoid; thymus B) sphenoid; pituitary C) ethmoid; pituitary D) sphenoid; thymuss

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