White matter of the spinal cord develops from the
A) mantle layer.
B) marginal layer.
C) notochord.
D) neurocoel.
E) neuroepithelial l
B) marginal layer.
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In animals insulated with fur or feathers, __________ heat loss is reduced
A) Convective B) Conductive C) Radiant D) More than one of the above Fill in the blank with the correct answer.
The term central nervous system refers to the ________.
A) autonomic nervous system B) brain, spinal cord, and peripheral nerves C) brain and spinal cord D) spinal cord and spinal nerves
The central chemoreceptors for respiration are located in the ________; they monitor the blood concentration(s) of ________.
A. aortic and carotid arteries; oxygen B. pons; carbon dioxide and hydrogen ions C. medulla oblongata; oxygen D. pons; oxygen E. medulla oblongata; carbon dioxide and hydrogen ions
The structural units of mature compact bone are called
A) lacunae. B) osteocytes. C) osteons. D) canaliculi. E) lamellae.