Bones About It Science Olympiad Practice Test Best — No

Know the feedback loop: Low blood Ca²⁺ → PTH released → PTH stimulates osteoclasts and increases kidney conversion of vitamin D to its active form (calcitriol) → calcitriol increases gut Ca²⁺ absorption.

: Correct spelling is often the deciding factor for ties. Core Knowledge Areas No Bones About It Science Olympiad Practice Test