Which statement is true regarding the action of an oligodendrocyte?
A. A neurolemmocyte attacks pathogens.
B. An oligodendrocyte is responsible for forming part of the blood-brain barrier.
C. Oligodendrocytes function only within the PNS.
D. Each oligodendrocyte can form a myelin sheath around many axons simultaneously.
E. Each oligodendrocyte can wrap only a 1-mm portion of a single axon.
Answer: D
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This figure shows a renal corpuscle. What structure does number 6 indicate?
A. Efferent arteriole B. Distal convoluted tubule C. Proximal convoluted tubule D. Afferent arteriole E. Nephron loop
Sympathetic splanchnic nerves are composed of
A. preganglionic sympathetic axons that synapse in a sympathetic trunk ganglion. B. preganglionic sympathetic axons that did not synapse in a sympathetic trunk ganglion. C. postganglionic sympathetic axons that synapse in a sympathetic trunk ganglion. D. postganglionic sympathetic axons that did not synapse in a sympathetic trunk ganglion. E. None of the choices is correct.
An area of the retina that contains only cones and is the site of sharpest vision is the
A) optic disc. B) inner segment. C) fovea. D) outer segment. E) tapetum lucidum.
Where is blood moving during the period of ejection?
A. Ventricles to atria B. Great vessels to ventricles C. Atria to great vessels D. Ventricles to great vessels E. Atria to ventricles