The blood-brain barrier is made up of
A. astrocyte perivascular feet and the falx cerebri.
B. astrocyte perivascular feet and capillary endothelial cells.
C. astrocyte extensions and dural sinuses.
D. ependymal cells and venous blood vessels.
E. microglial extensions and capillary endothelial cells.
Answer: B
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Keratinization softens cells.
Answer the following statement true (T) or false (F)
Ions in an ionic molecule are held together due to
A) the sharing of electrons. B) the attraction of opposite electrical charges. C) each electron orbiting all of the ions in the molecule. D) the presence of water molecules. E) the attraction of similar charges of the ions' protons.
________ cells are found in the sinusoids of the liver, and they remove debris from the blood as it flows past.
Fill in the blank(s) with the appropriate word(s).
What does the depolarization of the transverse tubules (T-tubules) promote?
A) binding of acetylcholine to ligand-gated sodium ion channels B) release of calcium from the sarcoplasmic reticulum C) entry of sodium ions into the muscle fiber through voltage-gated sodium ion channels D) release of acetylcholine from vesicles in the motor neuron into the synaptic cleft