Which of the following substances is continuously secreted by endothelial cells and causes vasodilation?
A) endothelin-1
B) bradykinin
C) oxygen
D) nitric oxide
E) adenosine
Answer: D) nitric oxide
Biology & Microbiology
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What characteristic does not describe a vertebrate?
a. notochord. b. backbone. c. exoskeleton. d. gills or lungs. e. posterior tail.
Biology & Microbiology
The receptors shown here are
a. mechanoreceptors. b. thermoreceptors. c. chemoreceptors. d. nociceptors. e. osmoreceptors.
Biology & Microbiology
Which of the following terms is associated with polychaetes?
A. radula B. metamorphosis C. parapodia D. mantle E. visceral mass
Biology & Microbiology
Which step of the photosynthesis pathway produces a carbohydrate from CO2 in the atmosphere?
A. the light reactions B. ATP production C. the Calvin cycle D. the C4 pathway
Biology & Microbiology