Which of the following is not part of the inflammatory response?
a. Localized vasodilation
b. Migration of neutrophils and macrophages to the site of injury
c. Kinin activation
d. Interferon inhibition of viral replication
e. Formation of interstitial-fluid clots that wall off bacterial invaders
D
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Sinoatrial node cells:
A. reach threshold only when action potentials generated by the AV node arrive through gap junctions. B. exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors. C. exhibit spontaneous depolarization that is speeded by activation of their beta-adrenergic receptors. D. exhibit a steep upstroke due to the presence of the same type of Na+ channels found in neuronal membranes. E. are in-between atrial muscle cells and cells of the bundle of His.
Melanoma can be easily prevented by decreasing exposure to ultraviolet (UV) light.
Answer the following statement true (T) or false (F)
Vitamin A plays a critical role in night vision because:
A. it is required for the synthesis of the retinal portion of rhodopsin. B. it is transformed into the opsins found in cone cells. C. it acts a coenzyme in the reaction that degrades cGMP within rod cells. D. it catalyzes the mitotic generation of light-reflecting epithelial cells, which support widely dispersed rod receptors. E. it is a key intermediate in the signal transduction pathway within cone cells that is activated by light.
The fetal period
A. extends from the beginning of the 12th week until birth. B. extends from the end of the 4th week until birth. C. extends from the beginning of the 9th week until birth. D. includes only the middle trimester. E. includes only the last trimester.