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.

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The receptors shown here are

a. mechanoreceptors. b. thermoreceptors. c. chemoreceptors. d. nociceptors. e. osmoreceptors.

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Which of the following terms is associated with polychaetes?

A. radula B. metamorphosis C. parapodia D. mantle E. visceral mass

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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