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
You might also like to view...
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.
As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads
burrow into the soil where they can hibernate for up to nine months. What is the benefit of hibernation?
a. reduced metabolic rate that ensures survival b. increased body temperature that ensures survival c. a period of time during which the animal completes sexual maturity d. all of these
Dinosaurs went extinct approximately ____
years ago.
a. 6500 b. 65,000 c. 650,000 d. 65,000,000 e. 650,000,000
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