The blood-brain barrier is made up of
A. microglial extensions and capillary endothelial cells.
B. ependymal cells and venous blood vessels.
C. astrocyte perivascular feet and capillary endothelial cells.
D. astrocyte extensions and dural sinuses.
E. astrocyte perivascular feet and the falx cerebri.
C
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Why does botox diminish frown lines?
A. It blocks acetylcholine receptors. B. It blocks sodium channels in motor neurons. C. It blocks the release of acetylcholine from motor neurons. D. It blocks the release of calcium from the sarcoplasmic reticulum. E. It blocks the binding site for myosin heads.
Label A represents which of the following structures?
A) syncytial trophoblast
B) developing villi
C) lacuna
D) uterine glands
E) amniotic cavity
The liver
A. produces secretions that help neutralize stomach acids and emulsify fats. B. stores vitamin C. C. produces several digestive enzymes. D. receives oxygenated blood from the portal vein. E. cannot synthesize new molecules.
The tissue that always has a "top" and a "bottom" is ________ tissue
A) epithelial B) connective C) muscle D) basal E) apical