Which cells of the retina form a network that either inhibits or facilitates communication between the photoreceptors and the bipolar cells?
A) horizontal cells
B) amacrine cells
C) bipolar cells
D) ganglion cells
A
Explanation:
B) Amacrine cells enhance communication between ganglion and bipolar cells.
C) Bipolar cells pass the signal from the photoreceptors to the ganglion cells.
D) The ganglion cells converge to form the optic nerve.
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The regions of myelinated axon membrane that have the highest permeability to ions are the
A. pia mater. B. glial cells. C. ganglia. D. synaptic membranes. E. nodes of Ranvier.
Which of the following is incorrect pertaining to coarctation of the aorta?
A) It is typically associated with reduced blood flow to the brain. B) It refers to a narrowing of the aorta. C) It typically occurs near the site of the attachment of the ligamentum arteriosum. D) It may be associated with enlarged internal thoracic and intercostal arteries. E) It may be associated with osteological changes in the ribs that are visible radiologically.
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