The receptors in the respiratory center are most sensitive to a small

A) increase in blood carbon dioxide levels.
B) increase in blood oxygen levels.
C) decrease in blood nitrogen levels.
D) decrease in blood oxygen levels.
E) increase in blood pH.


A

Biology & Microbiology

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What might happen to your red blood cells if your blood solute concentration began to fall rapidly below normal?

A. Your blood cells would stay the same size. B. Your blood cells would shrivel because water would move out of the cells via osmosis. C. Your blood cells would enlarge and could rupture because water would move into the cells via osmosis. D. We do not have enough information to answer this question.

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As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads

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Dinosaurs went extinct approximately ____

years ago.

a. 6500 b. 65,000 c. 650,000 d. 65,000,000 e. 650,000,000

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If yeasts are grown under anaerobic conditions, pyruvate is converted first to __________ and then to

__________. a. citrate; oxaloacetate b. acetyl coenzyme A; citrate c. lactate; carbon dioxide d. acetaldehyde; ethyl alcohol e. acetaldehyde; lactate

Biology & Microbiology