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
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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
The sella turcica is part of the ________ bone and houses the ________ gland
A) ethmoid; thymus B) sphenoid; pituitary C) ethmoid; pituitary D) sphenoid; thymuss
In the last step of blood coagulation,
a. fibrin is converted to fibrinogen b. fibrinogen is converted to fibrin c. platelet factor enters numerous reactions d. prothrombin is converted to thrombin e. thrombin is converted to prothrombin
Before B cells secrete antibodies, they differentiate into ________
A) macrophages B) T cells C) antigen-presenting cells D) plasma cells E) stem cells