Melatonin is an antioxidant that
a. accelerates metabolism
b. defends against free radicals
c. lowers the concentration of blood sugar
d. serves as a secondary messenger
e. stimulates reduction reactions
B
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Which vein directly drains the blood returning from the face and scalp?
A. Internal jugular vein B. External jugular vein C. Internal carotid veins D. External carotid veins
A ________ is a tubular organ that transports urine from a kidney to the urinary bladder.
Fill in the blank(s) with the appropriate word(s).
What kind of autonomic fibers are carried in the greater splanchnic nerve?
A. Preganglionic parasympathetic fibers B. Postganglionic parasympathetic fibers C. Myelinated fibers that run in the white communicating ramus D. Preganglionic sympathetic fibers E. Postganglionic sympathetic fibers
The greatest outflow from the dural venous sinuses is via the internal jugular vein.
Answer the following statement true (T) or false (F)