Biology
Which of the following may cause the breakdown of pyruvate into lactic acid in our muscles?

Lack of carbon dioxide
Lack of water
Lack of nitrogen
Lack of Oxygen

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Biology
The kidneys are stimulated to produce renin

By a decrease in the blood pressure
When the pH of the urine decreases
When the peritubular capillaries are dilated
When the specific gravity of urine rises above 1.10

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