Biology
The kidneys are stimulated to produce renin

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

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Biology
Which statement best describes Arteries?

They have thin walls and transport blood away from the heart
They have thin walls and transport blood toward the heart
They have thick walls and transport blood toward the heart
They have thick walls and transport blood away from the heart

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