Biology
When the diaphragm and external intercostal muscles contract,

The lungs shrink
The volume of the thorax decreases
The volume of the lungs decreases
The volume of the thorax increases

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Biology
The kidneys are stimulated to produce renin

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

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