Biology
One of the following is not a function of bones.

Production of blood corpuscles
Protection of vital organs
Place for muscle attachment
Secretion of hormones for calcium regulation in blood and bones

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Biology
The kidneys are stimulated to produce renin

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

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