Which of the following is not an effect of ultraviolet radiation?
A) increased activity by melanocytes
B) production of cholecalciferol within epidermal cells
C) reduced amounts of elastic fibers in the dermis
D) chromosomal damage in germinative cells or melanocytes
E) loss in skin pigmentation as seen in vitiligo
E
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The segment of the nephron between the proximal and distal tubules that loops down into the medulla of the kidney and returns back to the cortex is called the ________.
A) collecting duct B) vasa recta C) loop of Henle D) Bowman's capsule E) minor calyx
________ is the immunoglobulin class that comprises 75% of antibodies in adult blood.
A) IgE B) IgG C) IgD D) IgM E) IgA
Increasing the amount of myelination _______
A) has no effect on the time between action potentials B) increases the time between action potentials C) increases the time between action potentials only for small-diameter axons D) decreases the time between action potentials
Who has the highest percentage of water in the body?
A) adult male B) adult female C) infant D) elderly female E) elderly male