The parasympathetic division arises from the ________ regions of the spinal cord.
A. brain, lumbar, sacral, and coccygeal
B. brain and sacral
C. brain, thoracic, and lumbar
D. sacral and lumbar
E. brain, sacral, and coccygeal
Answer: B
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The first heart sound ("lubb") is associated with
A) atrial systole. B) closing of the atrioventricular valves. C) opening of the atrioventricular valves. D) closing of the semilunar valves. E) opening of the semilunar valves.
The molecule RNA contains the five -carbon sugar ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following skin cells does NOT play a role in immune function?
a. melanocytes b. keratinocytes c. dendritic cells d. Granstein cells e. All of these play a role in immune function.
In the nucleus, DNA is complexed with proteins to form a fine filamentous material called __________________.
Fill in the blank(s) with the appropriate word(s).